Take encoding into account in string functions.
#4111
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`"utf8"` * Add `string.chars` with encoding. * Fix default string escaping to properly fallback to `"ascii"` when utf8 escaping failed. Fixes: #4109
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string.lengthandstring.sub, default to"utf8"string.charswith encoding."ascii"when utf8 escaping failed.A global
settings.string.default_encodingoption is added to make it possible to revert to the previous behavior and assume"ascii"encoding for the impacted functions (string.lengthandstring.sub).Fixes: #4109