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Fix AmbiguousMatchException for default ValueTask<T> of reference types - #231
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A null default result matched both the ValueTask<T>(T) and ValueTask<T>(Task<T>) constructors, so Activator.CreateInstance threw for types like ValueTask<string>.
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DefaultValueProviderthrewAmbiguousMatchExceptionwhen asked for a defaultValueTask<T>whereTis a reference type, such asValueTask<string>.The default result is
null, andActivator.CreateInstancecan't choose between theValueTask<T>(T)andValueTask<T>(Task<T>)constructors for anullargument. The provider now binds theValueTask<T>(T)constructor explicitly.Added
DefaultForValueTaskOfReferenceTypeIsCompleted, which failed with the exception before the fix. All 173 tests pass.