The call [IsEqualTo] is ambiguous between the following methods or properties: 'TUnit.Assertions.Extensions.NumberIsExtensions.IsEqualTo(TUnit.Assertions.AssertConditions.Interfaces.IValueSource, TActual, string)' and 'TUnit.Assertions.Extensions.Generic.GenericIsExtensions.IsEqualTo(TUnit.Assertions.AssertConditions.Interfaces.IValueSource, TActual, string)'

I have multiple cases where it would be nice to have both methods in the same test class (of course I could always split the class but that creates a bunch of small files)

I assume you implement IsEqualTo for each number type (in my case int) and for IEquatable but all number types implement IEquatable. In .NET 9 you can fix this by adding the OverloadResolutionPriorityAttribute to one of the methods. but i think you only need one of the methods. OverloadResolutionPriorityAttribute only seems works for methods in the same class.