diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3a30c812..8f847ce5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -69,8 +69,8 @@ jobs:
           # smoketests for different toolchains
           - {toolchain: stable, os: windows-latest, experimental: false, flags: ""}
           - {toolchain: stable, os: macos-latest, experimental: false, flags: ""}
-          - {toolchain: beta, os: ubuntu-latest, experimental: false, flags: ""}
-          # nightly is a bit volatile
+          # data structure size changes - wait for beta to become stable and uncomment
+          #- {toolchain: beta, os: ubuntu-latest, experimental: false, flags: ""}
           #- {toolchain: nightly, os: ubuntu-latest, experimental: true, flags: ""}
       fail-fast: false
     steps:
diff --git a/src/api/call_fn.rs b/src/api/call_fn.rs
index 611ede44..ac1fb7f3 100644
--- a/src/api/call_fn.rs
+++ b/src/api/call_fn.rs
@@ -195,13 +195,14 @@ impl Engine {
     ///
     /// A [`GlobalRuntimeState`] and [`Caches`] need to be passed into the function, which can be
     /// created via [`GlobalRuntimeState::new`] and [`Caches::new`].
-    /// This makes repeatedly calling particular functions more efficient as the functions resolution cache
-    /// is kept intact.
+    ///
+    /// This makes repeatedly calling particular functions more efficient as the functions
+    /// resolution cache is kept intact.
     ///
     /// # Arguments
     ///
-    /// All the arguments are _consumed_, meaning that they're replaced by `()`.
-    /// This is to avoid unnecessarily cloning the arguments.
+    /// All the arguments are _consumed_, meaning that they're replaced by `()`. This is to avoid
+    /// unnecessarily cloning the arguments.
     ///
     /// Do not use the arguments after this call. If they are needed afterwards, clone them _before_
     /// calling this function.
@@ -246,6 +247,8 @@ impl Engine {
         arg_values: &mut [Dynamic],
     ) -> RhaiResult {
         let statements = ast.statements();
+        let lib = &[ast.as_ref()];
+        let mut this_ptr = this_ptr;
 
         let orig_scope_len = scope.len();
 
@@ -255,45 +258,48 @@ impl Engine {
             ast.resolver().cloned(),
         );
 
+        let mut result = Ok(Dynamic::UNIT);
+
         if eval_ast && !statements.is_empty() {
-            self.eval_global_statements(scope, global, caches, statements, &[ast.as_ref()], 0)?;
+            result = self.eval_global_statements(scope, global, caches, statements, lib, 0);
 
             if rewind_scope {
                 scope.rewind(orig_scope_len);
             }
         }
 
-        let mut this_ptr = this_ptr;
-        let mut args: StaticVec<_> = arg_values.iter_mut().collect();
+        result = result.and_then(|_| {
+            let mut args: StaticVec<_> = arg_values.iter_mut().collect();
 
-        // Check for data race.
-        #[cfg(not(feature = "no_closure"))]
-        crate::func::call::ensure_no_data_race(name, &args, false)?;
+            // Check for data race.
+            #[cfg(not(feature = "no_closure"))]
+            crate::func::call::ensure_no_data_race(name, &args, false).map(|_| Dynamic::UNIT)?;
 
-        let lib = &[ast.as_ref()];
-        let fn_def = ast
-            .shared_lib()
-            .get_script_fn(name, args.len())
-            .ok_or_else(|| ERR::ErrorFunctionNotFound(name.into(), Position::NONE))?;
-
-        let result = self.call_script_fn(
-            scope,
-            global,
-            caches,
-            lib,
-            &mut this_ptr,
-            fn_def,
-            &mut args,
-            rewind_scope,
-            Position::NONE,
-            0,
-        )?;
+            if let Some(fn_def) = ast.shared_lib().get_script_fn(name, args.len()) {
+                self.call_script_fn(
+                    scope,
+                    global,
+                    caches,
+                    lib,
+                    &mut this_ptr,
+                    fn_def,
+                    &mut args,
+                    rewind_scope,
+                    Position::NONE,
+                    0,
+                )
+            } else {
+                Err(ERR::ErrorFunctionNotFound(name.into(), Position::NONE).into())
+            }
+        });
 
         #[cfg(not(feature = "no_module"))]
         {
             global.embedded_module_resolver = orig_embedded_module_resolver;
         }
 
+        let result = result?;
+
         #[cfg(feature = "debugging")]
         if self.debugger.is_some() {
             global.debugger.status = crate::eval::DebuggerStatus::Terminate;
diff --git a/src/api/definitions/mod.rs b/src/api/definitions/mod.rs
index 171ca866..73908d04 100644
--- a/src/api/definitions/mod.rs
+++ b/src/api/definitions/mod.rs
@@ -4,7 +4,7 @@
 
 use crate::module::FuncInfo;
 use crate::tokenizer::{is_valid_function_name, Token};
-use crate::{Engine, FnAccess, Module, Scope, INT};
+use crate::{Engine, FnAccess, FnPtr, Module, Scope, INT};
 
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
@@ -545,6 +545,20 @@ fn def_type_name<'a>(ty: &'a str, engine: &'a Engine) -> Cow<'a, str> {
     #[cfg(not(feature = "no_float"))]
     let ty = ty.replace(type_name::<crate::FLOAT>(), "float");
 
+    #[cfg(not(feature = "no_index"))]
+    let ty = ty.replace(type_name::<crate::Array>(), "Array");
+
+    #[cfg(not(feature = "no_index"))]
+    let ty = ty.replace(type_name::<crate::Blob>(), "Blob");
+
+    #[cfg(not(feature = "no_object"))]
+    let ty = ty.replace(type_name::<crate::Map>(), "Map");
+
+    #[cfg(not(feature = "no_std"))]
+    let ty = ty.replace(type_name::<crate::Instant>(), "Instant");
+
+    let ty = ty.replace(type_name::<FnPtr>(), "FnPtr");
+
     ty.into()
 }
 
diff --git a/src/ast/expr.rs b/src/ast/expr.rs
index 0cc628f4..3b07ecfd 100644
--- a/src/ast/expr.rs
+++ b/src/ast/expr.rs
@@ -666,7 +666,7 @@ impl Expr {
                     #[cfg(not(feature = "no_module"))]
                     namespace: super::Namespace::NONE,
                     name: KEYWORD_FN_PTR.into(),
-                    hashes: calc_fn_hash(f.fn_name(), 1).into(),
+                    hashes: calc_fn_hash(None, f.fn_name(), 1).into(),
                     args: once(Self::StringConstant(f.fn_name().into(), pos)).collect(),
                     capture_parent_scope: false,
                     is_native_operator: false,
diff --git a/src/ast/stmt.rs b/src/ast/stmt.rs
index a9d3b096..68b63ecd 100644
--- a/src/ast/stmt.rs
+++ b/src/ast/stmt.rs
@@ -74,8 +74,8 @@ impl OpAssignment {
             .expect("op-assignment operator")
             .literal_syntax();
         Self {
-            hash_op_assign: calc_fn_hash(op.literal_syntax(), 2),
-            hash_op: calc_fn_hash(op_raw, 2),
+            hash_op_assign: calc_fn_hash(None, op.literal_syntax(), 2),
+            hash_op: calc_fn_hash(None, op_raw, 2),
             op_assign: op.literal_syntax(),
             op: op_raw,
             pos,
diff --git a/src/eval/global_state.rs b/src/eval/global_state.rs
index 83b2b076..775fdda0 100644
--- a/src/eval/global_state.rs
+++ b/src/eval/global_state.rs
@@ -285,8 +285,8 @@ impl GlobalRuntimeState<'_> {
     #[must_use]
     pub(crate) fn hash_idx_get(&mut self) -> u64 {
         if self.fn_hash_indexing == (0, 0) {
-            let n1 = crate::calc_fn_hash(crate::engine::FN_IDX_GET, 2);
-            let n2 = crate::calc_fn_hash(crate::engine::FN_IDX_SET, 3);
+            let n1 = crate::calc_fn_hash(None, crate::engine::FN_IDX_GET, 2);
+            let n2 = crate::calc_fn_hash(None, crate::engine::FN_IDX_SET, 3);
             self.fn_hash_indexing = (n1, n2);
             n1
         } else {
@@ -298,8 +298,8 @@ impl GlobalRuntimeState<'_> {
     #[must_use]
     pub(crate) fn hash_idx_set(&mut self) -> u64 {
         if self.fn_hash_indexing == (0, 0) {
-            let n1 = crate::calc_fn_hash(crate::engine::FN_IDX_GET, 2);
-            let n2 = crate::calc_fn_hash(crate::engine::FN_IDX_SET, 3);
+            let n1 = crate::calc_fn_hash(None, crate::engine::FN_IDX_GET, 2);
+            let n2 = crate::calc_fn_hash(None, crate::engine::FN_IDX_SET, 3);
             self.fn_hash_indexing = (n1, n2);
             n2
         } else {
diff --git a/src/eval/stmt.rs b/src/eval/stmt.rs
index 75d56a04..60587b4f 100644
--- a/src/eval/stmt.rs
+++ b/src/eval/stmt.rs
@@ -865,7 +865,7 @@ impl Engine {
                             #[cfg(not(feature = "no_module"))]
                             if global.scope_level == 0
                                 && access == AccessMode::ReadOnly
-                                && lib.iter().any(|&m| !m.is_empty())
+                                && lib.iter().any(|m| !m.is_empty())
                             {
                                 crate::func::locked_write(global.constants.get_or_insert_with(
                                     || {
diff --git a/src/func/call.rs b/src/func/call.rs
index 9445e714..e91d63a8 100644
--- a/src/func/call.rs
+++ b/src/func/call.rs
@@ -198,10 +198,8 @@ impl Engine {
         }
 
         let mut hash = args.as_ref().map_or(hash_base, |args| {
-            combine_hashes(
-                hash_base,
-                calc_fn_params_hash(args.iter().map(|a| a.type_id())),
-            )
+            let hash_params = calc_fn_params_hash(args.iter().map(|a| a.type_id()));
+            combine_hashes(hash_base, hash_params)
         });
 
         let cache = caches.fn_resolution_cache_mut();
@@ -217,19 +215,21 @@ impl Engine {
                 loop {
                     let func = lib
                         .iter()
-                        .find_map(|&m| m.get_fn(hash).map(|f| (f, m.id())))
-                        .or_else(|| {
-                            self.global_modules
-                                .iter()
-                                .find_map(|m| m.get_fn(hash).map(|f| (f, m.id())))
-                        });
+                        .copied()
+                        .chain(self.global_modules.iter().map(|m| m.as_ref()))
+                        .find_map(|m| m.get_fn(hash).map(|f| (f, m.id())));
 
                     #[cfg(not(feature = "no_module"))]
-                    let func = func.or_else(|| _global.get_qualified_fn(hash)).or_else(|| {
-                        self.global_sub_modules
-                            .values()
-                            .find_map(|m| m.get_qualified_fn(hash).map(|f| (f, m.id())))
-                    });
+                    let func = if args.is_none() {
+                        // Scripted functions are not exposed globally
+                        func
+                    } else {
+                        func.or_else(|| _global.get_qualified_fn(hash)).or_else(|| {
+                            self.global_sub_modules
+                                .values()
+                                .find_map(|m| m.get_qualified_fn(hash).map(|f| (f, m.id())))
+                        })
+                    };
 
                     if let Some((f, s)) = func {
                         // Specific version found
@@ -249,7 +249,7 @@ impl Engine {
 
                     // Check `Dynamic` parameters for functions with parameters
                     if allow_dynamic && max_bitmask == 0 && num_args > 0 {
-                        let is_dynamic = lib.iter().any(|&m| m.may_contain_dynamic_fn(hash_base))
+                        let is_dynamic = lib.iter().any(|m| m.may_contain_dynamic_fn(hash_base))
                             || self
                                 .global_modules
                                 .iter()
@@ -611,7 +611,7 @@ impl Engine {
                     if num_params < 0 || num_params > crate::MAX_USIZE_INT {
                         false
                     } else {
-                        let hash_script = calc_fn_hash(fn_name.as_str(), num_params as usize);
+                        let hash_script = calc_fn_hash(None, fn_name.as_str(), num_params as usize);
                         self.has_script_fn(Some(global), caches, lib, hash_script)
                     }
                     .into(),
@@ -815,7 +815,7 @@ impl Engine {
                 let fn_name = fn_ptr.fn_name();
                 let args_len = call_args.len() + fn_ptr.curry().len();
                 // Recalculate hashes
-                let new_hash = calc_fn_hash(fn_name, args_len).into();
+                let new_hash = calc_fn_hash(None, fn_name, args_len).into();
                 // Arguments are passed as-is, adding the curried arguments
                 let mut curry = FnArgsVec::with_capacity(fn_ptr.curry().len());
                 curry.extend(fn_ptr.curry().iter().cloned());
@@ -857,8 +857,8 @@ impl Engine {
                 // Recalculate hash
                 let new_hash = FnCallHashes::from_all(
                     #[cfg(not(feature = "no_function"))]
-                    calc_fn_hash(fn_name, args_len),
-                    calc_fn_hash(fn_name, args_len + 1),
+                    calc_fn_hash(None, fn_name, args_len),
+                    calc_fn_hash(None, fn_name, args_len + 1),
                 );
                 // Replace the first argument with the object pointer, adding the curried arguments
                 let mut curry = FnArgsVec::with_capacity(fn_ptr.curry().len());
@@ -944,8 +944,8 @@ impl Engine {
                             // Recalculate the hash based on the new function name and new arguments
                             hash = FnCallHashes::from_all(
                                 #[cfg(not(feature = "no_function"))]
-                                calc_fn_hash(fn_name, call_args.len()),
-                                calc_fn_hash(fn_name, call_args.len() + 1),
+                                calc_fn_hash(None, fn_name, call_args.len()),
+                                calc_fn_hash(None, fn_name, call_args.len() + 1),
                             );
                         }
                     }
@@ -1036,9 +1036,9 @@ impl Engine {
                 // Recalculate hash
                 let args_len = total_args + curry.len();
                 hashes = if hashes.is_native_only() {
-                    FnCallHashes::from_native(calc_fn_hash(name, args_len))
+                    FnCallHashes::from_native(calc_fn_hash(None, name, args_len))
                 } else {
-                    calc_fn_hash(name, args_len).into()
+                    calc_fn_hash(None, name, args_len).into()
                 };
             }
             // Handle Fn()
@@ -1110,7 +1110,7 @@ impl Engine {
                 return Ok(if num_params < 0 || num_params > crate::MAX_USIZE_INT {
                     false
                 } else {
-                    let hash_script = calc_fn_hash(&fn_name, num_params as usize);
+                    let hash_script = calc_fn_hash(None, &fn_name, num_params as usize);
                     self.has_script_fn(Some(global), caches, lib, hash_script)
                 }
                 .into());
diff --git a/src/func/hashing.rs b/src/func/hashing.rs
index a7ef71fb..bc29f67b 100644
--- a/src/func/hashing.rs
+++ b/src/func/hashing.rs
@@ -91,7 +91,7 @@ pub fn get_hasher() -> ahash::AHasher {
 /// The first module name is skipped.  Hashing starts from the _second_ module in the chain.
 #[inline]
 #[must_use]
-pub fn calc_qualified_var_hash<'a>(
+pub fn calc_var_hash<'a>(
     modules: impl IntoIterator<Item = &'a str, IntoIter = impl ExactSizeIterator<Item = &'a str>>,
     var_name: &str,
 ) -> u64 {
@@ -113,9 +113,11 @@ pub fn calc_qualified_var_hash<'a>(
 /// Calculate a non-zero [`u64`] hash key from a namespace-qualified function name
 /// and the number of parameters, but no parameter types.
 ///
-/// Module names are passed in via `&str` references from an iterator.
+/// Module names making up the namespace are passed in via `&str` references from an iterator.
 /// Parameter types are passed in via [`TypeId`] values from an iterator.
 ///
+/// If the function is not namespace-qualified, pass [`None`] as the namespace.
+///
 /// # Zeros
 ///
 /// If the hash happens to be zero, it is mapped to `DEFAULT_HASH`.
@@ -125,15 +127,15 @@ pub fn calc_qualified_var_hash<'a>(
 /// The first module name is skipped.  Hashing starts from the _second_ module in the chain.
 #[inline]
 #[must_use]
-pub fn calc_qualified_fn_hash<'a>(
-    modules: impl IntoIterator<Item = &'a str, IntoIter = impl ExactSizeIterator<Item = &'a str>>,
+pub fn calc_fn_hash<'a>(
+    namespace: impl IntoIterator<Item = &'a str, IntoIter = impl ExactSizeIterator<Item = &'a str>>,
     fn_name: &str,
     num: usize,
 ) -> u64 {
     let s = &mut get_hasher();
 
     // We always skip the first module
-    let iter = modules.into_iter();
+    let iter = namespace.into_iter();
     let len = iter.len();
     iter.skip(1).for_each(|m| m.hash(s));
     len.hash(s);
@@ -146,20 +148,6 @@ pub fn calc_qualified_fn_hash<'a>(
     }
 }
 
-/// Calculate a non-zero [`u64`] hash key from a non-namespace-qualified function name
-/// and the number of parameters, but no parameter types.
-///
-/// Parameter types are passed in via [`TypeId`] values from an iterator.
-///
-/// # Zeros
-///
-/// If the hash happens to be zero, it is mapped to `DEFAULT_HASH`.
-#[inline(always)]
-#[must_use]
-pub fn calc_fn_hash(fn_name: &str, num: usize) -> u64 {
-    calc_qualified_fn_hash(None, fn_name, num)
-}
-
 /// Calculate a non-zero [`u64`] hash key from a list of parameter types.
 ///
 /// Parameter types are passed in via [`TypeId`] values from an iterator.
diff --git a/src/func/mod.rs b/src/func/mod.rs
index d9b9db8c..8298a63e 100644
--- a/src/func/mod.rs
+++ b/src/func/mod.rs
@@ -20,8 +20,7 @@ pub use callable_function::CallableFunction;
 #[cfg(not(feature = "no_function"))]
 pub use func::Func;
 pub use hashing::{
-    calc_fn_hash, calc_fn_params_hash, calc_qualified_fn_hash, calc_qualified_var_hash,
-    combine_hashes, get_hasher, StraightHashMap,
+    calc_fn_hash, calc_fn_params_hash, calc_var_hash, combine_hashes, get_hasher, StraightHashMap,
 };
 pub use native::{
     locked_read, locked_write, shared_get_mut, shared_make_mut, shared_take, shared_take_or_clone,
diff --git a/src/func/native.rs b/src/func/native.rs
index 851f52e7..f421c262 100644
--- a/src/func/native.rs
+++ b/src/func/native.rs
@@ -321,11 +321,11 @@ impl<'a> NativeCallContext<'a> {
         let hash = if is_method_call {
             FnCallHashes::from_all(
                 #[cfg(not(feature = "no_function"))]
-                calc_fn_hash(fn_name, args_len - 1),
-                calc_fn_hash(fn_name, args_len),
+                calc_fn_hash(None, fn_name, args_len - 1),
+                calc_fn_hash(None, fn_name, args_len),
             )
         } else {
-            calc_fn_hash(fn_name, args_len).into()
+            calc_fn_hash(None, fn_name, args_len).into()
         };
 
         self.engine()
diff --git a/src/func/script.rs b/src/func/script.rs
index 8309c6ba..8ccc876b 100644
--- a/src/func/script.rs
+++ b/src/func/script.rs
@@ -240,7 +240,7 @@ impl Engine {
         }
 
         // First check script-defined functions
-        let result = lib.iter().any(|&m| m.contains_fn(hash_script))
+        let result = lib.iter().any(|m| m.contains_fn(hash_script))
             // Then check the global namespace and packages
             || self.global_modules.iter().any(|m| m.contains_fn(hash_script));
 
diff --git a/src/lib.rs b/src/lib.rs
index f09e2b66..bb26d72b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -237,10 +237,7 @@ pub use func::Shared;
 /// Alias to [`RefCell`][std::cell::RefCell] or [`RwLock`][std::sync::RwLock] depending on the `sync` feature flag.
 pub use func::Locked;
 
-pub(crate) use func::{
-    calc_fn_hash, calc_fn_params_hash, calc_qualified_fn_hash, calc_qualified_var_hash,
-    combine_hashes,
-};
+pub(crate) use func::{calc_fn_hash, calc_fn_params_hash, calc_var_hash, combine_hashes};
 
 pub use rhai_codegen::*;
 
diff --git a/src/module/mod.rs b/src/module/mod.rs
index e027f384..a07a82d3 100644
--- a/src/module/mod.rs
+++ b/src/module/mod.rs
@@ -9,8 +9,8 @@ use crate::func::{
 };
 use crate::types::{dynamic::Variant, BloomFilterU64, CustomTypesCollection};
 use crate::{
-    calc_fn_hash, calc_fn_params_hash, calc_qualified_fn_hash, combine_hashes, Dynamic, Identifier,
-    ImmutableString, NativeCallContext, RhaiResultOf, Shared, SmartString, StaticVec,
+    calc_fn_hash, calc_fn_params_hash, combine_hashes, Dynamic, Identifier, ImmutableString,
+    NativeCallContext, RhaiResultOf, Shared, SmartString, StaticVec,
 };
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
@@ -150,7 +150,7 @@ pub fn calc_native_fn_hash<'a>(
     fn_name: &str,
     params: &[TypeId],
 ) -> u64 {
-    let hash_script = calc_qualified_fn_hash(modules, fn_name, params.len());
+    let hash_script = calc_fn_hash(modules, fn_name, params.len());
     let hash_params = calc_fn_params_hash(params.iter().copied());
     combine_hashes(hash_script, hash_params)
 }
@@ -182,8 +182,8 @@ pub struct Module {
     /// Flattened collection of all functions, native Rust and scripted.
     /// including those in sub-modules.
     all_functions: Option<StraightHashMap<CallableFunction>>,
-    /// Native Rust functions (in scripted hash format) that contain [`Dynamic`] parameters.
-    dynamic_functions: BloomFilterU64,
+    /// Bloom filter on native Rust functions (in scripted hash format) that contain [`Dynamic`] parameters.
+    dynamic_functions_filter: BloomFilterU64,
     /// Iterator functions, keyed by the type producing the iterator.
     type_iterators: Option<BTreeMap<TypeId, Shared<IteratorFn>>>,
     /// Flattened collection of iterator functions, including those in sub-modules.
@@ -300,7 +300,7 @@ impl Module {
             all_variables: None,
             functions: StraightHashMap::with_capacity_and_hasher(capacity, Default::default()),
             all_functions: None,
-            dynamic_functions: BloomFilterU64::new(),
+            dynamic_functions_filter: BloomFilterU64::new(),
             type_iterators: None,
             all_type_iterators: None,
             indexed: true,
@@ -442,7 +442,7 @@ impl Module {
         self.all_variables = None;
         self.functions.clear();
         self.all_functions = None;
-        self.dynamic_functions.clear();
+        self.dynamic_functions_filter.clear();
         self.type_iterators = None;
         self.all_type_iterators = None;
         self.indexed = false;
@@ -662,7 +662,7 @@ impl Module {
         let value = Dynamic::from(value);
 
         if self.indexed {
-            let hash_var = crate::calc_qualified_var_hash(Some(""), &ident);
+            let hash_var = crate::calc_var_hash(Some(""), &ident);
             self.all_variables
                 .get_or_insert_with(|| Default::default())
                 .insert(hash_var, value.clone());
@@ -692,7 +692,7 @@ impl Module {
 
         // None + function name + number of arguments.
         let num_params = fn_def.params.len();
-        let hash_script = crate::calc_fn_hash(&fn_def.name, num_params);
+        let hash_script = crate::calc_fn_hash(None, &fn_def.name, num_params);
         #[cfg(feature = "metadata")]
         let params_info = fn_def.params.iter().map(Into::into).collect();
         self.functions.insert(
@@ -1021,11 +1021,12 @@ impl Module {
         };
 
         let name = name.as_ref();
-        let hash_fn = calc_native_fn_hash(None, name, &param_types);
+        let hash_script = calc_fn_hash(None, name, param_types.len());
+        let hash_params = calc_fn_params_hash(param_types.iter().copied());
+        let hash_fn = combine_hashes(hash_script, hash_params);
 
         if is_dynamic {
-            self.dynamic_functions
-                .mark(calc_fn_hash(name, param_types.len()));
+            self.dynamic_functions_filter.mark(hash_script);
         }
 
         self.functions.insert(
@@ -1546,7 +1547,7 @@ impl Module {
     #[inline(always)]
     #[must_use]
     pub(crate) fn may_contain_dynamic_fn(&self, hash_script: u64) -> bool {
-        !self.dynamic_functions.is_absent(hash_script)
+        !self.dynamic_functions_filter.is_absent(hash_script)
     }
 
     /// Does the particular namespace-qualified function exist in the [`Module`]?
@@ -1591,7 +1592,7 @@ impl Module {
             None => self.variables = other.variables,
         }
         self.functions.extend(other.functions.into_iter());
-        self.dynamic_functions += &other.dynamic_functions;
+        self.dynamic_functions_filter += &other.dynamic_functions_filter;
         match self.type_iterators {
             Some(ref mut m) if other.type_iterators.is_some() => {
                 m.extend(other.type_iterators.unwrap().into_iter())
@@ -1634,7 +1635,7 @@ impl Module {
             None => self.variables = other.variables,
         }
         self.functions.extend(other.functions.into_iter());
-        self.dynamic_functions += &other.dynamic_functions;
+        self.dynamic_functions_filter += &other.dynamic_functions_filter;
         match self.type_iterators {
             Some(ref mut m) if other.type_iterators.is_some() => {
                 m.extend(other.type_iterators.unwrap().into_iter())
@@ -1684,7 +1685,7 @@ impl Module {
         for (&k, v) in &other.functions {
             self.functions.entry(k).or_insert_with(|| v.clone());
         }
-        self.dynamic_functions += &other.dynamic_functions;
+        self.dynamic_functions_filter += &other.dynamic_functions_filter;
         if let Some(ref type_iterators) = other.type_iterators {
             let t = self
                 .type_iterators
@@ -1760,7 +1761,7 @@ impl Module {
                 })
                 .map(|(&k, v)| (k, v.clone())),
         );
-        self.dynamic_functions += &other.dynamic_functions;
+        self.dynamic_functions_filter += &other.dynamic_functions_filter;
 
         if let Some(ref type_iterators) = other.type_iterators {
             if let Some(ref mut t) = self.type_iterators {
@@ -1804,7 +1805,7 @@ impl Module {
             })
             .collect();
 
-        self.dynamic_functions.clear();
+        self.dynamic_functions_filter.clear();
         self.all_functions = None;
         self.all_variables = None;
         self.all_type_iterators = None;
@@ -2126,7 +2127,7 @@ impl Module {
             // Index all variables
             if let Some(ref v) = module.variables {
                 for (var_name, value) in v {
-                    let hash_var = crate::calc_qualified_var_hash(path.iter().copied(), var_name);
+                    let hash_var = crate::calc_var_hash(path.iter().copied(), var_name);
                     variables.insert(hash_var, value.clone());
                 }
             }
@@ -2135,7 +2136,6 @@ impl Module {
             if let Some(ref t) = module.type_iterators {
                 for (&type_id, func) in t {
                     type_iterators.insert(type_id, func.clone());
-                    contains_indexed_global_functions = true;
                 }
             }
 
@@ -2160,7 +2160,7 @@ impl Module {
                     functions.insert(hash_qualified_fn, f.func.clone());
                 } else if cfg!(not(feature = "no_function")) {
                     let hash_qualified_script =
-                        crate::calc_qualified_fn_hash(path.iter().copied(), &f.name, f.num_params);
+                        crate::calc_fn_hash(path.iter().copied(), &f.name, f.num_params);
                     functions.insert(hash_qualified_script, f.func.clone());
                 }
             }
@@ -2248,7 +2248,6 @@ impl Module {
             self.all_type_iterators
                 .get_or_insert_with(|| Default::default())
                 .insert(type_id, func.clone());
-            self.contains_indexed_global_functions = true;
         }
         self.type_iterators
             .get_or_insert_with(|| Default::default())
diff --git a/src/optimizer.rs b/src/optimizer.rs
index 0b7a13c2..b9a4dd97 100644
--- a/src/optimizer.rs
+++ b/src/optimizer.rs
@@ -151,7 +151,7 @@ impl<'a> OptimizerState<'a> {
                 &mut self.caches,
                 lib,
                 fn_name,
-                calc_fn_hash(fn_name, arg_values.len()),
+                calc_fn_hash(None, fn_name, arg_values.len()),
                 &mut arg_values.iter_mut().collect::<StaticVec<_>>(),
                 false,
                 false,
@@ -1229,7 +1229,7 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, _chaining: bool) {
         => {
             // First search for script-defined functions (can override built-in)
             #[cfg(not(feature = "no_function"))]
-            let has_script_fn = state.lib.iter().any(|&m| m.get_script_fn(&x.name, x.args.len()).is_some());
+            let has_script_fn = state.lib.iter().copied().any(|m| m.get_script_fn(&x.name, x.args.len()).is_some());
             #[cfg(feature = "no_function")]
             let has_script_fn = false;
 
diff --git a/src/parser.rs b/src/parser.rs
index 4d22d30b..20600e0b 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -358,9 +358,9 @@ impl Expr {
             Self::Variable(x, .., pos) => {
                 let ident = x.3.clone();
                 let getter = state.get_interned_getter(ident.as_str());
-                let hash_get = calc_fn_hash(&getter, 1);
+                let hash_get = calc_fn_hash(None, &getter, 1);
                 let setter = state.get_interned_setter(ident.as_str());
-                let hash_set = calc_fn_hash(&setter, 2);
+                let hash_set = calc_fn_hash(None, &setter, 2);
 
                 Self::Property(
                     Box::new(((getter, hash_get), (setter, hash_set), ident)),
@@ -576,7 +576,7 @@ impl Engine {
 
                 #[cfg(not(feature = "no_module"))]
                 let hash = if namespace.is_empty() {
-                    calc_fn_hash(&id, 0)
+                    calc_fn_hash(None, &id, 0)
                 } else {
                     let root = namespace.root();
                     let index = state.find_module(root);
@@ -600,10 +600,10 @@ impl Engine {
 
                     namespace.set_index(index);
 
-                    crate::calc_qualified_fn_hash(namespace.iter().map(Ident::as_str), &id, 0)
+                    crate::calc_fn_hash(namespace.iter().map(Ident::as_str), &id, 0)
                 };
                 #[cfg(feature = "no_module")]
-                let hash = calc_fn_hash(&id, 0);
+                let hash = calc_fn_hash(None, &id, 0);
 
                 let hashes = if is_valid_function_name(&id) {
                     hash.into()
@@ -645,7 +645,7 @@ impl Engine {
 
                     #[cfg(not(feature = "no_module"))]
                     let hash = if namespace.is_empty() {
-                        calc_fn_hash(&id, args.len())
+                        calc_fn_hash(None, &id, args.len())
                     } else {
                         let root = namespace.root();
                         let index = state.find_module(root);
@@ -668,14 +668,10 @@ impl Engine {
 
                         namespace.set_index(index);
 
-                        crate::calc_qualified_fn_hash(
-                            namespace.iter().map(Ident::as_str),
-                            &id,
-                            args.len(),
-                        )
+                        crate::calc_fn_hash(namespace.iter().map(Ident::as_str), &id, args.len())
                     };
                     #[cfg(feature = "no_module")]
-                    let hash = calc_fn_hash(&id, args.len());
+                    let hash = calc_fn_hash(None, &id, args.len());
 
                     let hashes = if is_valid_function_name(&id) {
                         hash.into()
@@ -1470,7 +1466,7 @@ impl Engine {
                     },
                 )?;
 
-                let hash_script = calc_fn_hash(&func.name, func.params.len());
+                let hash_script = calc_fn_hash(None, &func.name, func.params.len());
                 lib.insert(hash_script, func.into());
 
                 expr
@@ -1835,7 +1831,7 @@ impl Engine {
         #[cfg(not(feature = "no_module"))]
         if let Some((.., namespace, hash, name)) = namespaced_variable {
             if !namespace.is_empty() {
-                *hash = crate::calc_qualified_var_hash(namespace.iter().map(Ident::as_str), name);
+                *hash = crate::calc_var_hash(namespace.iter().map(Ident::as_str), name);
 
                 #[cfg(not(feature = "no_module"))]
                 {
@@ -1919,7 +1915,7 @@ impl Engine {
 
                         Ok(FnCallExpr {
                             name: state.get_interned_string("-"),
-                            hashes: FnCallHashes::from_native(calc_fn_hash("-", 1)),
+                            hashes: FnCallHashes::from_native(calc_fn_hash(None, "-", 1)),
                             args,
                             pos,
                             is_native_operator: true,
@@ -1947,7 +1943,7 @@ impl Engine {
 
                         Ok(FnCallExpr {
                             name: state.get_interned_string("+"),
-                            hashes: FnCallHashes::from_native(calc_fn_hash("+", 1)),
+                            hashes: FnCallHashes::from_native(calc_fn_hash(None, "+", 1)),
                             args,
                             pos,
                             is_native_operator: true,
@@ -1966,7 +1962,7 @@ impl Engine {
 
                 Ok(FnCallExpr {
                     name: state.get_interned_string("!"),
-                    hashes: FnCallHashes::from_native(calc_fn_hash("!", 1)),
+                    hashes: FnCallHashes::from_native(calc_fn_hash(None, "!", 1)),
                     args,
                     pos,
                     is_native_operator: true,
@@ -2187,8 +2183,8 @@ impl Engine {
                 // Recalculate hash
                 func.hashes = FnCallHashes::from_all(
                     #[cfg(not(feature = "no_function"))]
-                    calc_fn_hash(&func.name, func.args.len()),
-                    calc_fn_hash(&func.name, func.args.len() + 1),
+                    calc_fn_hash(None, &func.name, func.args.len()),
+                    calc_fn_hash(None, &func.name, func.args.len() + 1),
                 );
 
                 let rhs = Expr::MethodCall(func, func_pos);
@@ -2233,8 +2229,8 @@ impl Engine {
                         // Recalculate hash
                         func.hashes = FnCallHashes::from_all(
                             #[cfg(not(feature = "no_function"))]
-                            calc_fn_hash(&func.name, func.args.len()),
-                            calc_fn_hash(&func.name, func.args.len() + 1),
+                            calc_fn_hash(None, &func.name, func.args.len()),
+                            calc_fn_hash(None, &func.name, func.args.len() + 1),
                         );
 
                         let new_lhs = BinaryExpr {
@@ -2338,7 +2334,7 @@ impl Engine {
             settings.ensure_level_within_max_limit(state.max_expr_depth)?;
 
             let op = op_token.syntax();
-            let hash = calc_fn_hash(&op, 2);
+            let hash = calc_fn_hash(None, &op, 2);
 
             let op_base = FnCallExpr {
                 name: state.get_interned_string(op.as_ref()),
@@ -2412,7 +2408,7 @@ impl Engine {
 
                     // Convert into a call to `contains`
                     FnCallExpr {
-                        hashes: calc_fn_hash(OP_CONTAINS, 2).into(),
+                        hashes: calc_fn_hash(None, OP_CONTAINS, 2).into(),
                         args,
                         name: state.get_interned_string(OP_CONTAINS),
                         ..op_base
@@ -2427,7 +2423,7 @@ impl Engine {
                         .get(s.as_str())
                         .map_or(false, Option::is_some) =>
                 {
-                    let hash = calc_fn_hash(&s, 2);
+                    let hash = calc_fn_hash(None, &s, 2);
                     let pos = args[0].start_position();
 
                     FnCallExpr {
@@ -3345,7 +3341,7 @@ impl Engine {
 
                         let func = func?;
 
-                        let hash = calc_fn_hash(&func.name, func.params.len());
+                        let hash = calc_fn_hash(None, &func.name, func.params.len());
 
                         if !lib.is_empty() && lib.contains_key(&hash) {
                             return Err(PERR::FnDuplicatedDefinition(
@@ -3657,6 +3653,7 @@ impl Engine {
         let expr = FnCallExpr {
             name: state.get_interned_string(crate::engine::KEYWORD_FN_PTR_CURRY),
             hashes: FnCallHashes::from_native(calc_fn_hash(
+                None,
                 crate::engine::KEYWORD_FN_PTR_CURRY,
                 num_externals + 1,
             )),
diff --git a/src/serde/metadata.rs b/src/serde/metadata.rs
index 47b9d1f0..51011585 100644
--- a/src/serde/metadata.rs
+++ b/src/serde/metadata.rs
@@ -66,7 +66,7 @@ impl Ord for FnMetadata<'_> {
 
 impl<'a> From<&'a FuncInfo> for FnMetadata<'a> {
     fn from(info: &'a FuncInfo) -> Self {
-        let base_hash = calc_fn_hash(&info.name, info.num_params);
+        let base_hash = calc_fn_hash(None, &info.name, info.num_params);
         let (typ, full_hash) = if info.func.is_script() {
             (FnType::Script, base_hash)
         } else {
diff --git a/src/types/bloom_filter.rs b/src/types/bloom_filter.rs
index 61a1d360..9400879b 100644
--- a/src/types/bloom_filter.rs
+++ b/src/types/bloom_filter.rs
@@ -7,8 +7,11 @@ use std::{
     ops::{Add, AddAssign},
 };
 
+/// Number of bits for a `usize`.
+const USIZE_BITS: usize = mem::size_of::<usize>() * 8;
+
 /// Number of `usize` values required for 256 bits.
-const SIZE: usize = (256 / 8) / mem::size_of::<usize>();
+const SIZE: usize = 256 / USIZE_BITS;
 
 /// A simple bloom filter implementation for `u64` hash values only - i.e. all 64 bits are assumed
 /// to be relatively random.
@@ -26,7 +29,7 @@ impl BloomFilterU64 {
     #[must_use]
     const fn calc_hash(value: u64) -> (usize, usize) {
         let hash = (value & 0x00ff) as usize;
-        (hash / 64, 0x01 << (hash % 64))
+        (hash / USIZE_BITS, 0x01 << (hash % USIZE_BITS))
     }
     /// Create a new [`BloomFilterU64`].
     #[inline(always)]