[php-src] Issue #8281: mb_convert_encoding "\" (backslash) and "~" (tilde) convert failed to Shift_JIS

Issue: https://github.com/php/php-src/issues/8281 Comment Author: sj-i As a Japanese, I think rollbacking for now is also an OK choice. https://packagist.org/php-statistics According to the stats from packagist, the adoption of PHP 8.1 is about to reach 20%, but still 20%. Only a subset of them are affected by this BC breakage and should have already applied a workaround for it. And a further small subset would be the workaround that would cause problems if this BC breakage were "fixed" in a point release. The number of people affected by this will be much smaller than those who upgrade to 8.1 in the future and are affected by the current incompatibility.