Fix potential unicode conversion issues for *nix#7506

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tex3d wants to merge 3 commits intomicrosoft:mainfrom

tex3d:unicode-fixes

Commits on Jun 3, 2025

Fix unicode conversion bugs for *nix
tex3d
committed

Commits on Aug 29, 2025

Replace (size_t)-1 with ~(size_t)0 to avoid unsigned cast of -1
tex3d
committed

Commits on Sep 2, 2025

Remove OOB index assert, catch more invalid uses/overflows
tex3d
committed