[whatwg/webidl] Allow users of "invoke a callback function" to report the exception (PR #1424)

This makes it more concise for users to, as is frequently desired for undefined-returning callbacks especially, immediately catch and report the exception rather than needing to handle it themselves.

This isn't appropriate for other types of callback functions, where a result may be expected or the exception needs to be rethrown. Callers need to explicitly decide which behavior they want, unless the callback returns a promise type, in which case exceptions are turned into rejected promises implicitly.

Fixes #1423.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1424

-- Commit Summary --

  * Allow users of "invoke a callback function" to report the exception

-- File Changes --

    M index.bs (22)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1424.patch
https://github.com/whatwg/webidl/pull/1424.diff

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