Restrict mappingproxy ordering, use final codec registry normalization, and prefer index conversion before float conversion for sleep. Retain universal Python assertions and import the matching final codec/time canonical test hunks plus the non-ASCII codec-name deprecation warning.
Upstream source: CPython d220409a13b77de7a6c30abe16ea90db01528edc. The existing codec normalization implementation and bytecode contract remain unchanged.
Assisted-by: OpenAI Codex:model identifier unavailable
Extract the Python 3.14 comparison contract from #8954 without its 3.15 ordering restrictions or defensive copies. Return the wrapped mapping comparison result without truth conversion. Cover all six direct and reflected operations in the existing mappingproxy snippet.
Assisted-by: OpenAI Codex:model identifier unavailable