[heycam/webidl] Carry out math operations on real numbers, not IEEE 754. (#316)

Explicitly convert +0 and −0 to 0.

Closes #306.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/316

-- Commit Summary --

  * Carry out math operations on real numbers, not IEEE 754.

-- File Changes --

    M index.bs (14)

-- Patch Links --

https://github.com/heycam/webidl/pull/316.patch
https://github.com/heycam/webidl/pull/316.diff

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https://github.com/heycam/webidl/pull/316