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Implement LWG-4398: `enable_nonlocking_formatter_optimization` should be disabled for container adaptors
Closes #4924. Closes #5860.
Partial template specializations added in 96bcef5cb8d2dad0e1412cd800f447e56cbfcbb1 are redundant (this code already does the job), but IMO they improve the readability of the code.
This should also resolve #4924.
I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.