On 8/3/23 13:55, Hans Krentel via internals wrote:
This is a proposal to consider to discuss/change the default value ofNumberFormatter::ROUNDING_MODE from current NumberFormatter::ROUND_HALFEVEN to NumberFormatter::ROUND_HALFUP . I got the attention of this from an unrelated user in an online forum (SO) and also checked with MDN which has it as default as well. [1] If I'm not mistaken, ROUND_HALFUP is the rounding with number_format() and the default rounding mode with round(). Feedback from actual ICU caretakers would be good though, because me is entirely from a users perspective, also I know how to change attributes to non default values, this is not a programming question I have. I hope you don't mind the attention to detail. Best -- hakre[1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat/NumberFormat#roundingmode
The default rounding mode in ICU for the number formatter appears to be "half even," and that's probably why it's the default in PHP.
See:- https://unicode-org.github.io/icu/userguide/format_parse/numbers/rounding-modes#half-even
- https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1number_1_1NumberFormatterSettings.html#aceb7d34843e0d44e138fb3f43c98db32
The MDN documentation you linked to describes the JavaScript implementation of ECMA-402, which differs from ICU in a number of ways. One of which is in the default rounding mode for `Intl.NumberFormat`, which is not the same as ICU's `NumberFormatter` (even though most ECMA-402 implementations use icu4c internally).
Here's where ECMA-402 defines `halfExpand` as the default for `roundingMode` (see step 10 under section 15.1.3):
https://tc39.es/ecma402/#sec-setnfdigitoptionsSince PHP's intl extension follows icu4c and not ECMA-402, I think it makes sense for it to continue to use the same default values as icu4c.
Cheers, Ben
OpenPGP_signature
Description: OpenPGP digital signature
