Fix spec validation & merge so that default values are correctly applied

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

examples/tests/export/invalid/format/main.cue

@@ -14,8 +14,6 @@ teststring: {
 				echo something > /tmp/out
 				""",
 			]
-			// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
-			dir: "/"
 		},
 		{
 			do: "export"

examples/tests/export/invalid/validation/main.cue

@@ -15,8 +15,6 @@ test: {
 				printf something > /tmp/out
 				""",
 			]
-			// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
-			dir: "/"
 		},
 		{
 			do: "export"

examples/tests/export/number/main.cue

@@ -14,8 +14,6 @@ test: {
 				echo -123.5 > /tmp/out
 				""",
 			]
-			// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
-			dir: "/"
 		},
 		{
 			do: "export"

examples/tests/export/string/main.cue

@@ -14,8 +14,6 @@ test: {
 				printf something > /tmp/out
 				""",
 			]
-			// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
-			dir: "/"
 		},
 		{
 			do: "export"

examples/tests/export/withvalidation/main.cue

@@ -15,8 +15,6 @@ test: {
 				printf something > /tmp/out
 				""",
 			]
-			// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
-			dir: "/"
 		},
 		{
 			do: "export"

examples/tests/export/yaml/main.cue

@@ -12,8 +12,6 @@ test: #dagger: compute: [
 			[milk, pumpkin pie, eggs, juice]" > /tmp/out
 			""",
 		]
-		// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
-		dir: "/"
 	},
 	{
 		do: "export"