Cool, thanks for clarifications!
To make sure, as per the "intended semantics", we never allow splitting a
valid surrogate pair (= matching only one of the surrogates but not the
other), and thus we'll differ from the Java implementation here:
/foo(.+)bar\1/u.test("foo\uD834bar\uD834\uDC00"); we say "false", Java says
"true".
Correct, the captures List entry is [\uD834], so when performing 21.2.2.9 AtomEscape, \uD834 is
matched against \uD834\uDC00 in step 8 which results in a failure state.
(In addition, /^(.+)\1$/u.test("\uDC00foobar\uD834\uDC00foobar\uD834") ==
false.)
Yes, this expression also returns false.
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