Update implemented/not-implemented

README.md

@@ -431,6 +431,9 @@ not the subset of ValueScript that has actually been implemented.
 - Array standard methods (`.sort`, `.map`, `.filter`, etc.)
 - Most string standard methods (`.includes`, `.slice`, `.split`, etc.)
 - BigInt
+- Iterators
+- Spread operator on iterables
+- Generators (except `yield*`)
 - Many unusual JS things:
   - `[] + [] -> ""`
   - `[10, 1, 3].sort() -> [1, 10, 3]`
@@ -469,9 +472,9 @@ not the subset of ValueScript that has actually been implemented.
   - `{} === {} -> true`
   - JS: `-> false`
   - This is a value semantics thing - objects don't have identity
-- Iterators
-- Rest and spread
-- Generators
+- `yield*`
+- Object spreading
+- Rest params
 - Async functions
 - TypeScript enums
 - TypeScript namespaces