Nullness - option<> must be indicated as nullable in IL for C# consumers #17528
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vzarytovskii
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Aug 13, 2024
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vzarytovskii
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psfinaki
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This was referenced Aug 28, 2024
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F#
option<>Has UseNullAsTrueValueAttribute on it, making the representation ofNonenullin IL.Therefore, even if the type is not considered
null(assignment, pattern matching, ..) in F#, it must reported as nullable for C# consumers.This can be also demonstrated at runtime by using the reflection helpers at
NullabilityInfoContext(test added).This covers all types marked as UseNullAsTrueValue as well as (~legacy, not recommended under
--checknulls+) types marked with AllowNull.