`RuntimeReflection` is not a subclass of `PolymorphicReflection`
`RuntimeReflection` is not a subclass of `PolymorphicReflection`

`PolymorphicReflection` is an internal class that is used in
`ThroughReflection`. But `RuntimeReflection` is used for the head of
chain in `AssociationScope`. These are totally different things.

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