The two unsafe functions in std::ascii might be unnecessary. #9058
Description
PLACEHOLDER: FUNCTIONS ARE PART OF A UNLANDED PULL REQUEST
std::ascii contains the two unsafe functions str_map_bytes and str_copy_map_bytes. Both implement mapping a look up table over an byte vector using unsafe code and pointer arithmetic. It is unclear if that's intentionally done for speed, or whether an more idiomatic implementation using iterators would be just as fast. In case of the latter, the functions should probably be rewritten/removed.