Jakub Mazurkiewicz

* Remove `used by pair, tuple, (...)` comment from `_Fill_align_and_width_specs` - it no longer serves its purpose. * Make `_Fill_align_and_width_specs_setter::_Specs` member variable protected, so that we can create derived `_Range_specs_setter`....

`<format>`: Underlying formatters of `pair-or-tuple` formatter cannot access format args

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Underlying formatters of [`pair-or-tuple`](http://eel.is/c++draft/format.tuple) formatter should be able to call `format_ctx.arg(I)` and get correct format arg. Example: ```c++ #include #include template struct substitute_arg {}; template struct std::formatter { template constexpr...

`<print>`: `std::print` may incorrectly display multibyte characters

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# Describe the bug `std::print` incorrectly displays characters that take two or more bytes, when they appear at the boundary of 256 bytes long chunk. This happens only when `stdout`...

Partially implement #5856. I believe we should close #5856 and mention LWG-4272 in #3807.

Implement LWG-4398: `enable_nonlocking_formatter_optimization` should be disabled for container adaptors

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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.