feat: iteration protocols

src/util/collection.ts

@@ -1,8 +1,9 @@
-import { isNil, isString, isObject, isArray } from './underscore'
+import { isNil, isString, isObject, isArray, isIterable } from './underscore'
 
 export function toEnumerable (val: any) {
   if (isArray(val)) return val
   if (isString(val) && val.length > 0) return [val]
+  if (isIterable(val)) return Array.from(val)
   if (isObject(val)) return Object.keys(val).map((key) => [key, val[key]])
   return []
 }