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ValueTuple generic types do not specify rules for comparison
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Description
# ValueTuple generic types do not specify rules for comparison
In addition to explicit interface implementations that support a custom comparison method, each generic `ValueTuple` type has a `CompareTo` method that compares the instance with a tuple of that type. However, the rules for comparison are not specified. Since they are specified in the case of the generic Tuple types, they should be documented for ValueTuple as well, so that there is parity between Tuple and ValueTuple generic types.
See also dotnet/docs#2956, which noted that the documentation for `ValueTuple.CompareTo(ValueTuple)`, the comparison method for a 0-tuple, was incorrect.
/cc @int19h
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