Merge `main` to `feature/flat_map` - #6014

Merged

Stephan T. Lavavej (StephanTLavavej) merged 20 commits into

microsoft:feature/flat_mapfrom

StephanTLavavej:merge-flat-map

Jan 15, 2026

Commits on Dec 12, 2025

Update tests for upcoming compiler changes to `consteval` (#5960)
Stephan T. Lavavej (StephanTLavavej)
authored
cbe2ee9

Commits on Jan 8, 2026

Use division by 100 in `to_string` for integers (#5691)

Alex Guteniev (AlexGuteniev)
and
Stephan T. Lavavej (StephanTLavavej)
authored
641410d
Implement P3016R6 Resolve Inconsistencies In `begin`/`end` For `valarray` And Braced Initializer Lists (#5847)

Vojtěch Michal (vmichal)
and
Stephan T. Lavavej (StephanTLavavej)
authored
7364b42
Enable vectorized minmax_element using Neon on ARM64 (#5949)

Hari Limaye (hazzlim)
and
Stephan T. Lavavej (StephanTLavavej)
authored
58d2910
The Uncanny xmath Overhaul (#5959)
Stephan T. Lavavej (StephanTLavavej)
authored
eec1e28
`<regex>`: Simplify unwinding (#5961)
Julian Müller (muellerj3)
authored
649a76a
Update working draft revision to N5032 (#5967)
Shengxin Pei (TPPPP72)
authored
12b5859
`<atomic>`: drop `_Atomic_reinterpret_as` (#5973)
Alex Guteniev (AlexGuteniev)
authored
e7d5bf7
Vectorize `replace_copy` for x64 / x86 manually (#5980)

Alex Guteniev (AlexGuteniev)
and
Stephan T. Lavavej (StephanTLavavej)
authored
b3f2c67
updated _MSVC_STL_UPDATE to January 2026 (#5985)
Que (chai-shai)
authored
ba946a1
Fix no-match handling when calling `memchr`/`wmemchr` on ARM64EC (#5993)
Hari Limaye (hazzlim)
authored
4634ad4

Commits on Jan 15, 2026