[hrithiksaini99]

Fixes the false positive reported in #16441: codecs.CodecInfo.decode / encode returned by codecs.lookup were typed via positional-only Protocol callables, so calling with errors="..." keyword was rejected even though the runtime bound methods accept it.

import codecs

codec = codecs.lookup("utf-8")
codec.decode(b"potato", errors="replace")  # was: Unexpected keyword argument "errors"
codec.encode("hello", errors="replace")    # was: Unexpected keyword argument "errors"

The errors parameter is now positional-or-keyword, matching the runtime signature.

Agent: DeepSeek V4.1 Flash (OpenCode).

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[srittau]

Dupe with your own PR ...