Add `Type.GetNullableUnderlyingType()` virtual API#126905

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AaronRobinsonMSFT wants to merge 24 commits intodotnet:mainfrom

AaronRobinsonMSFT:fix/124216-nullable-getunderlyingtype

Commits on Mar 10, 2026

Add Type.GetNullableUnderlyingType() virtual API

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Commits on Apr 14, 2026

Address review feedback for Type.GetNullableUnderlyingType()

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Merge remote-tracking branch 'upstream/main' into fix/124216-nullable-getunderlyingtype
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Improve MLC tests: throwOnError and stronger assertions

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Commits on Apr 15, 2026

Commits on Apr 16, 2026

Commits on Apr 17, 2026

Fix GetNullableUnderlyingType crashes and wrong results

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Commits on Apr 24, 2026

Commits on Apr 27, 2026