see what happen if || 0 is replaced with a function call

Author: GarboMuffin

src/compiler/jsexecute.js

@@ -223,6 +223,11 @@ runtimeFunctions.retire = `const retire = () => {
     thread.target.runtime.sequencer.retireThread(thread);
 }`;
 
+runtimeFunctions.NaNToZero = `const NaNToZero = value => {
+    if (isNaN(value)) return 0;
+    return value;
+}`;
+
 /**
  * Scratch cast to boolean.
  * Similar to Cast.toBoolean()

src/compiler/jsgen.js

@@ -185,9 +185,9 @@ class JSGenerator {
                 return `(+${this.descendInput(node.target.toType(InputType.BOOLEAN))})`;
             }
             if (node.target.isAlwaysType(InputType.NUMBER_OR_NAN)) {
-                return `(${this.descendInput(node.target)} || 0)`;
+                return `NaNToZero(${this.descendInput(node.target)})`;
             }
-            return `(+${this.descendInput(node.target)} || 0)`;
+            return `NaNToZero(+${this.descendInput(node.target)})`;
         case InputOpcode.CAST_NUMBER_OR_NAN:
             return `(+${this.descendInput(node.target)})`;
         case InputOpcode.CAST_NUMBER_INDEX: