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Fix strict optional with generic defaults (#21788)

This was regressed in #21526

Fixes #21777

Co-authored-by: Codex
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Shantanu committed
60fa82e5d8984020cb741a62020671dacdfc482c
Parent: 722047e
Committed by GitHub <noreply@github.com> on 7/30/2026, 1:28:32 AM