[heycam/webidl] Use map/exists to define dictionary/present. (#610)

Fixes #381.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/610

-- Commit Summary --

  * Use map/exists to define dictionary/present.

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/heycam/webidl/pull/610.patch
https://github.com/heycam/webidl/pull/610.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/heycam/webidl/pull/610