Re: [whatwg/webidl] Inconsistent enumerability on keys/values/entries and friends (#738)

@EdgarChen @saschanaz @yuki3 @shvaikalesh let's settle this once and for all. This is trivial but is an interop issue and consistency issue and now I started testing it in https://github.com/web-platform-tests/wpt/commit/31f5f5e952f84df73a9673c5ecc2e835d4ba44dc and that caused a bunch of WPT idlharness failures :).

Here is my proposal:

- maplike:
  - size, entries, keys, values, forEach, get, has, set, delete, clear: enumerable (*)
  - `@@iterator`: non-enumerable
- setlike:
  - size, entries, keys, values, forEach, has, add, delete, clear: enumerable (*)
  - `@@iterator`: non-enumerable
- iterables:
  - entries, keys, values, forEach: enumerable
  - `@@iterator`: non-enumerable

(*) = change from current Web IDL spec.

Does this sound good? Explicit thumbs-up votes appreciated, especially from implementers.

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