Timothy Flynn a57e2f9a76 LibJS: Combine UTF-16 surrogate pairs when concatenating strings ...

In the following use case:

    "\ud834" + "\udf06"

We were previously combining these as two individual code points. When
concatenating strings, we must take care to combine the high surrogate
from the left-hand side with the low surrogate from the right-hand side.

2022-01-18 00:49:16 +00:00

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