Probably a regression of this issue #8179

What version of protobuf and what language are you using?
Version: v4.28.2 installed with composer as a dependency of googleads/google-ads-php v24.0.0
Language: PHP

What operating system (Linux, Windows, ...) and version?
Linux Mint

What runtime / compiler are you using (e.g., python version or gcc version)
PHP 8.2

What did you do?
Steps to reproduce the behavior:

• Have a default locale set to cs_CZ.utf8
• Make a google ads api call that returns floats
• Try calling serializeToJsonString on resulting stream

What did you expect to see

• Resulting JSON is valid

What did you see instead?

• The resulting JSON is invalid with commas as decimal separators

The error is at src/Google/Protobuf/Internal/GPBJsonWire.php:161 where the sprintf format is %.8g where g seems to be locale aware.

When using

$locale = setlocale(LC_ALL, 0);
setlocale(LC_ALL, 'C');
$result[] = Json::decode($googleAdsRow->serializeToJsonString(), Json::FORCE_ARRAY);
setlocale(LC_ALL, $locale);

The error is not present.

Anything else we should know about your project / environment
PHP installed is from the ondrej PPA