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Brad King authored
The previous implementation assumed that only one byte would be given in the `from` buffer by the caller at a time. This may be true for MSVC but is not for the GNU library on Windows. Re-implement these methods to handle more than one byte per call. Also simplify the state management by keeping all state between calls directly in the `mbstate_t` argument instead of using it to index our own heap-allocated state. Fixes: #16893
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