diff --git a/README.md b/README.md
index 7ba0a1b..2626458 100644
--- a/README.md
+++ b/README.md
@@ -1582,6 +1582,12 @@ terminology to reference different levels of API's:
     In the above example `iter` is a generator instance.
 
 
+Iterators and generators are similar but not the same. Some objects like `Array`'s, 
+`Map`'s and `Set`'s provide a number of generic iterators that are not implemented 
+as generators. These objects are also extended by `ig-types/generator` to match the 
+`<generator>` object API defined below.
+
+
 
 #### `generator.Generator`
 
diff --git a/generator.js b/generator.js
index 5c69aff..610d849 100644
--- a/generator.js
+++ b/generator.js
@@ -66,7 +66,17 @@ module.Generator =
 	(function*(){}).constructor
 
 
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+// base iterator prototypes...
+var ITERATOR_PROTOTYPES = [
+	Array,
+	Set,
+	Map,
+].map(function(e){ 
+	return (new e()).values().__proto__ })
+
+
+
+//---------------------------------------------------------------------
 
 // generic generator wrapper...
 var iter = 
@@ -395,6 +405,13 @@ GeneratorMixin(GeneratorPrototype)
 GeneratorProtoMixin(GeneratorPrototype.prototype)
 
 
+// Extend base iterators...
+ITERATOR_PROTOTYPES
+	.forEach(function(proto){
+		GeneratorProtoMixin(proto) })
+
+
+
 //---------------------------------------------------------------------
 // Generators...
 
diff --git a/package.json b/package.json
index ec11328..44f5489 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ig-types",
-  "version": "6.3.2",
+  "version": "6.4.0",
   "description": "Generic JavaScript types and type extensions...",
   "main": "main.js",
   "scripts": {