Partial fix to type mapping inference for primitive collections #31110
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This is a targeted fix to #31030, but larger type mapping inference problems still remain in the context of primitive collections (see #31109). The issue is that we were checking reference identity between type mappings to detect conflicting/incompatible inferred mappings, but that's two strict, as there could exist two type mapping instances which are equal. Switching to comparing the store type instead.
@ajcvickers should we consider implementing Equals on type mappings, so the we can also make sure that e.g. value converters don't differ?
Closes #31030