Add bytes method for strings.

CHANGELOG.md

@@ -38,6 +38,7 @@ Enhancements
 * More information is provided to the error variable captured by the `catch` statement in an _object map_.
 * Previously, `private` functions in an `AST` cannot be called with `call_fn` etc. This is inconvenient when trying to call a function inside a script which also serves as a loadable module exporting part (but not all) of the functions. Now, all functions (`private` or not) can be called in an `AST`. The `private` keyword is relegated to preventing a function from being exported.
 * `Dynamic::as_unit` just for completeness sake.
+* `bytes` method added for strings to get length quickly (if the string is ASCII-only).
 
 
 Version 0.19.13

src/packages/string_more.rs

@@ -12,7 +12,7 @@ def_package!(crate:MoreStringPackage:"Additional string utilities, including str
     // Register string iterator
     lib.set_iter(
         TypeId::of::<ImmutableString>(),
-        |string: Dynamic| Box::new(string.cast::<ImmutableString>().chars().collect::<Vec<_>>().into_iter().map(Into::into))
+        |string| Box::new(string.cast::<ImmutableString>().chars().collect::<Vec<_>>().into_iter().map(Into::into))
     );
 });
 
@@ -42,6 +42,10 @@ mod string_functions {
     pub fn len(string: &str) -> INT {
         string.chars().count() as INT
     }
+    #[rhai_fn(name = "bytes", get = "bytes")]
+    pub fn bytes(string: &str) -> INT {
+        string.len() as INT
+    }
     pub fn remove(string: &mut ImmutableString, sub_string: ImmutableString) {
         *string -= sub_string;
     }