Ryan Liptak a155e35850
std.json: Fix decoding of UTF-16 surrogate pairs (#16830)
* std.unicode: Add more UTF-16 decoding functions

This mostly makes parts of Utf16LeIterator reusable

* std.json: Fix decoding of UTF-16 surrogate pairs

Before this commit, there were 524,288 codepoints that would get decoded improperly. After this commit, there are 0.

Fixes #16828
2023-08-15 09:11:59 -04:00
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