Final JSON fixes

Author: CubesterYT

src/blocks/scratch3_looks.js

@@ -256,7 +256,7 @@ class Scratch3LooksBlocks {
         }
 
         // Limit the length of the string.
-        text = String(text).substr(0, Scratch3LooksBlocks.SAY_BUBBLE_LIMIT);
+        text = Cast.toString(text).substr(0, Scratch3LooksBlocks.SAY_BUBBLE_LIMIT);
 
         return text;
     }
@@ -395,7 +395,7 @@ class Scratch3LooksBlocks {
             target.setCostume(optZeroIndex ? requestedCostume : requestedCostume - 1);
         } else {
             // Strings should be treated as costume names, where possible
-            const costumeIndex = target.getCostumeIndexByName(requestedCostume.toString());
+            const costumeIndex = target.getCostumeIndexByName(Cast.toString(requestedCostume));
 
             if (costumeIndex !== -1) {
                 target.setCostume(costumeIndex);
@@ -429,7 +429,7 @@ class Scratch3LooksBlocks {
             stage.setCostume(optZeroIndex ? requestedBackdrop : requestedBackdrop - 1);
         } else {
             // Strings should be treated as backdrop names where possible
-            const costumeIndex = stage.getCostumeIndexByName(requestedBackdrop.toString());
+            const costumeIndex = stage.getCostumeIndexByName(Cast.toString(requestedBackdrop));
 
             if (costumeIndex !== -1) {
                 stage.setCostume(costumeIndex);

src/compiler/jsgen.js

@@ -177,7 +177,7 @@ class ConstantInput {
     }
 
     asString () {
-        return `"${sanitize('' + this.constantValue)}"`;
+        return `"${sanitize('' + this.constantValue)}"`; // Should this be updated to use "Cast.toString"?
     }
 
     asBoolean () {