Ignore optionality in the comparable relationship #12202
Merged
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Fixes #1447.
Fixes #12187.
The intent behind the comparability relationship is that it should succeed if two types could actually be one and the same at runtime. With optionality, the intent is that a property could be there at runtime, and so it makes sense for comparability to take that into account. Comparability should succeed regardless of property optionality.