Merge `main` to `feature/flat_map` - #5339

Merged

Stephan T. Lavavej (StephanTLavavej) merged 14 commits into

microsoft:feature/flat_mapfrom

StephanTLavavej:merge-flat_map

Mar 13, 2025

Commits on Feb 21, 2025

STL Hardening (#5274)
Stephan T. Lavavej (StephanTLavavej)
authored
dfdccda

Commits on Feb 25, 2025

`<spanstream>`: Fix ambiguity among constructors of `basic_ispanstream` (#5309)
A. Jiang (frederick-vs-ja)
authored
25cfafb
Unblock RWC by extending the static call operator workaround (#5312)

Stephan T. Lavavej (StephanTLavavej)
and
David Justo (davidmrdavid)
authored
3b2a52e

Commits on Mar 3, 2025

Destructor Tombstones (#5318)
Stephan T. Lavavej (StephanTLavavej)
authored
0d8f517

Commits on Mar 13, 2025