Change the Dict.prototype.getRawValues method to return an iterator

This method is usually used with loops, and it should be a tiny bit more efficient to use an iterator directly rather than first iterating through ` Map`-values to create a temporary `Array` that we finally iterate through at the call-site.

Note that the `getRawValues` method is old code, and originally the `Dict` class stored its data in a regular `Object`, hence why the old code was written that way.

Author: Snuffleupagus

src/core/primitives.js

@@ -185,7 +185,7 @@ class Dict {
 
   // No dereferencing.
   getRawValues() {
-    return [...this._map.values()];
+    return this._map.values();
   }
 
   getRawEntries() {

test/unit/primitives_spec.js

@@ -284,7 +284,7 @@ describe("primitives", function () {
     it("should get all raw values", function () {
       // Test direct objects:
       const expectedRawValues1 = [testFontFile, testFontFile2, testFontFile3];
-      const rawValues1 = dictWithManyKeys.getRawValues();
+      const rawValues1 = [...dictWithManyKeys.getRawValues()];
 
       expect(rawValues1.sort()).toEqual(expectedRawValues1);
 
@@ -305,7 +305,7 @@ describe("primitives", function () {
       dict.set("Contents", contentsRef);
 
       const expectedRawValues2 = [contentsRef, resourcesRef, typeName];
-      const rawValues2 = dict.getRawValues();
+      const rawValues2 = [...dict.getRawValues()];
 
       expect(rawValues2.sort()).toEqual(expectedRawValues2);
     });
@@ -380,8 +380,8 @@ describe("primitives", function () {
       expect(mergedFontDictKeys).toEqual(["F1"]);
       expect(mergedSubFontDictKeys).toEqual(["F1", "F2", "F3"]);
 
-      const mergedFontDictValues = mergedFontDict.getRawValues();
-      const mergedSubFontDictValues = mergedSubFontDict.getRawValues();
+      const mergedFontDictValues = [...mergedFontDict.getRawValues()];
+      const mergedSubFontDictValues = [...mergedSubFontDict.getRawValues()];
 
       expect(mergedFontDictValues).toEqual(["Local font one"]);
       expect(mergedSubFontDictValues).toEqual([