[Discussion] sscanf/fscanf %c whitespace handling in master, GH-19088

Hi internals, I opened a PR for GH-19088 to fix %c handling in sscanf() / fscanf(): https://github.com/php/php-src/pull/22041 The issue is that %c already does not skip leading whitespace, but after that it still shared the %s scan path and stopped at whitespace. The PR keeps %c separate so it consumes the requested characters, including whitespace. There was some concern on the PR that this behavior has existed since PHP 4.3.2, so even if this is a bug fix it may still have BC impact for code relying on the old behavior. The PR is targeting master only and has an UPGRADING note. Before this gets merged, does anyone see this as problematic for master? Thanks, Pratik