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Subject: [PHP-DEV] [RFC] [discussion] Correctly name the rounding mode and make it an Enum
Message-ID: <81CBE5A8-9FAF-40DA-8EAB-9F19C2278E75@sakiot.com>
Date: Fri, 31 May 2024 23:49:16 +0900
To: php internals <internals@lists.php.net>
From: saki@sakiot.com (Saki Takamachi)

Hi, internals!

I would like to start an RFC discussion regarding rounding modes.
=
https://wiki.php.net/rfc/correctly_name_the_rounding_mode_and_make_it_an_e=
num

As mentioned previously by Gina on the mailing list [1], there are some =
issues with PHP's current rounding mode.
[1] - https://externals.io/message/123126

    =E2=80=A2 First, the value is just an int, so we need to verify that =
the value passed is a valid rounding mode.
    =E2=80=A2 The second problem is that the behavior of the =E2=80=9Cup=E2=
=80=9D and =E2=80=9Cdown=E2=80=9D modes does not match the mathematical =
definition. Especially for non-native speakers, the different rounding =
modes might also be more easily confused, compared to a naming that uses =
less abstract terms.

To resolve these issues, change the naming to something appropriate and =
use Enums instead of int constants.

Please see the RFC for details.

Regards,

Saki=