Anthony Sottile <asott...@umich.edu> added the comment:

to me this is the same as the Union[Pattern] / Union[Match] "fixes" that landed 
in 3.5.3 -- and the pain caused by using that and having CI pass (because of 
modern 3.5.x) but having spurious bug reports from users stuck on 3.5.2

or in 3.6.1 when NamedTuple was "fixed" to allow methods, again having CI pass 
with modern pythons but having frustrated users running 3.6.0

I forsee the same class of problems here with Annotated where it works great in 
3.10.3 and 3.9.11 but anyone stuck on 3.10.2 or 3.9.10 or older will be broken

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46491>
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