fix: constructor exposure

array.js

@@ -18,8 +18,10 @@ ArrayIterator = module.exports = function (arr, kind) {
 };
 if (setPrototypeOf) setPrototypeOf(ArrayIterator, Iterator);
 
+// Internal %ArrayIteratorPrototype% doesn't expose its constructor
+delete ArrayIterator.prototype.constructor;
+
 ArrayIterator.prototype = Object.create(Iterator.prototype, {
-	constructor: d(ArrayIterator),
 	_resolve: d(function (i) {
 		if (this.__kind__ === "value") return this.__list__[i];
 		if (this.__kind__ === "key+value") return [i, this.__list__[i]];

index.js

@@ -24,11 +24,13 @@ module.exports = Iterator = function (list, context) {
 	context.on("_clear", this._onClear);
 };
 
+// Internal %IteratorPrototype% doesn't expose its constructor
+delete Iterator.prototype.constructor;
+
 defineProperties(
 	Iterator.prototype,
 	assign(
 		{
-			constructor: d(Iterator),
 			_next: d(function () {
 				var i;
 				if (!this.__list__) return undefined;

string.js

@@ -17,8 +17,10 @@ StringIterator = module.exports = function (str) {
 };
 if (setPrototypeOf) setPrototypeOf(StringIterator, Iterator);
 
+// Internal %ArrayIteratorPrototype% doesn't expose its constructor
+delete StringIterator.prototype.constructor;
+
 StringIterator.prototype = Object.create(Iterator.prototype, {
-	constructor: d(StringIterator),
 	_next: d(function () {
 		if (!this.__list__) return undefined;
 		if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;