don't state that Callable is a special form - #2214
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This was referenced Mar 9, 2026
JelleZijlstra
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Callable is still a special form for two reasons: (1) variance and (2) type checkers may use different attribute semantics than with a bare callable protocol, though that's not specified.
We can revisit this once ParamSpec variance is accepted.
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discussion: https://discuss.python.org/t/callable-isnt-a-special-form/106407
Callable is a normal class, it doesn't have any special meaning in the type system, it's the same as the definitions of Iterable etc