tree 594a1ab21436be785faf5d92a51eca4e24ea0535
parent 7dfbf7912e17ac04a3ecfccb7b396bfbfc896307
author Mike Kruskal <mkruskal@google.com> 1726623319 -0700
committer Copybara-Service <copybara-worker@google.com> 1726623686 -0700

Fix packed reflection handling bug in edition 2023.

This is a very narrow edge case where touching a packed extension via generated APIs first, and then doing so reflectively will trigger a DCHECK.  Otherwise, reflective APIs will work but not use packed encoding for the extension.  This was likely a pre-existing bug dating back to proto3, where it would only be visible on custom options (the only extensions allowed in proto3).

To help qualify this and uncover similar issues, unittest.proto was migrated to editions.  This turned up some other minor issues in DebugString and python.

PiperOrigin-RevId: 675785611