Remove runtime parametric type checking #9082
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Runtime type checking is a waste of performance. We have container types
(list, set, dict) that type check their contents as they are
constructed or modified.
This type-checking is disabled at runtime (by substituting
_check_typemethod for
_identity), but there is still some overhead of thesecontainer types even existing.
This PR aims to remove these container types.
As the first step, i've disabled type checking entirely, to see if there
is any runtime mechanism relying on it.