[whatwg/streams] Tidy up range checking (#477)

/cc @wanderview
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/477

-- Commit Summary --

  * Use IsFiniteNonNegativeNumber in EnqueueValueWithSize
  * Use RangeError instead of TypeError for NaN high water marks

-- File Changes --

    M index.bs (6)
    M reference-implementation/lib/helpers.js (7)

-- Patch Links --

https://github.com/whatwg/streams/pull/477.patch
https://github.com/whatwg/streams/pull/477.diff

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