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Editorial: Add note about when ToASCII = ASCII lowercase #598

Merged
merged 1 commit into from
May 19, 2021
Merged

Editorial: Add note about when ToASCII = ASCII lowercase #598

merged 1 commit into from
May 19, 2021

Commits on May 19, 2021

  1. Editorial: Add note about when ToASCII = ASCII lowercase 

    Many implementations currently skip ToASCII if domain is ASCII-only, but
as discovered in [1] and [2], this can result in some undesirable
behavior. Adding a note prevents implementors from making the mistake of
thinking ToASCII is a no-op if the input is ASCII, and also provides a
recommendation on how to properly optimize the ToASCII step.

[1]: whatwg#267
[2]: whatwg#309 (comment)
    @TimothyGu
    TimothyGu committed May 19, 2021
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