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Conceptually, this makes sense because a type is not intrinsically top or bottom or raw, but only in the context of a type system. This also makes these predicates much more maintainable and puts them in a form identical to the one at the RTI level. Change-Id: I83154a82cef6cbaa9c4d0f27cb95f01473c1e015 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149049 Commit-Queue: Mayank Patke <fishythefish@google.com> Reviewed-by: Stephen Adams <sra@google.com>