Nikolas Klauser b6bfb199cc
[libc++] Fix {deque,vector}::append_range assuming too much about the types (#162438)
Currently, `deque` and `vector`'s `append_range` is implemented in terms
of `insert_range`. The problem with that is that `insert_range` has more
preconditions, resulting in us rejecting valid code.

This also significantly improves performance for `deque` in some cases.
2026-01-09 12:06:43 +01:00
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