RFC: Add the RoundingMode enum (#14833)

see https://wiki.php.net/rfc/correctly_name_the_rounding_mode_and_make_it_an_enum

Co-authored-by: Saki Takamachi <saki@php.net>
Co-author

RFC: Add the RoundingMode enum (#14833)

see https://wiki.php.net/rfc/correctly_name_the_rounding_mode_and_make_it_an_enum

Co-authored-by: Saki Takamachi <saki@php.net>
Co-authored-by: Niels Dossche <7771979+nielsdos@users.noreply.github.com>

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round(): Validate the rounding mode (#12252)