Remove unused _append_ops_call_method, fix _property_data_from_member call signature, replace sys.version_info guard with hasattr check for __buffer__ protocol, fix implicit string concatenations, add msgbus overrides for 4.0-4.4, add conformance tests, and add publish script. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>