Jacob Pratt 8905be5ef3
Rollup merge of #126980 - Borgerr:fix-extendfromslice-check, r=workingjubilee
set self.is_known_utf8 to false in extend_from_slice

try-job: x86_64-msvc

closes #126977
Related to #126885, #126333, and [this conversation](<aa46a3368e (r143539097)>)
2024-06-27 02:06:20 -04:00
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