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The main change is to allow a UCS scalar value as fill character. Especially for char based formatting this increase the number of valid characters. Originally this was to be expected ABI breaking, however the current change does not seem to break the ABI. Implements - P2572 std::format() fill character allowances Depends on D144499 Reviewed By: ldionne, tahonermann, #libc Differential Revision: https://reviews.llvm.org/D144742