Merge `main` to `feature/flat_map` - #4352

Merged

Stephan T. Lavavej (StephanTLavavej) merged 21 commits into

microsoft:feature/flat_mapfrom

StephanTLavavej:merge-flat_map

Jan 31, 2024

Commits on Jan 19, 2024

`<xcharconv_ryu.h>`: `__umulh` is already an intrinsic for `_M_HYBRID_X86_ARM64` (#4330)
Stephan T. Lavavej (StephanTLavavej)
authored
442029c

Commits on Jan 24, 2024

`iter_value_t<I>` should always use direct-initialization (#4233)

authored
2644138
`<sstream>`: Don't swap `basic_stringbuf`s in move assignment and allocator-extended construction (#4239)

A. Jiang (frederick-vs-ja)
and
Stephan T. Lavavej (StephanTLavavej)
authored
63aeb77

Commits on Jan 25, 2024

Commits on Jan 27, 2024

ARM64 test improvements (#4341)
Casey Carter (CaseyCarter)
authored
32e65ac

Commits on Jan 30, 2024

Commits on Jan 31, 2024

Merge branch 'main' into merge-flat_map
Stephan T. Lavavej (StephanTLavavej)
committed
fdd2b35