`PolymorphicReflection` is not using the methods from `ThroughReflection`
`PolymorphicReflection` is not using the methods from `ThroughReflection`

`ThroughReflection` initializes `@delegate_reflection` and delegate all
public methods to `delegate_reflection`. But `PolymorphicReflection`
does not initialize `@delegate_reflection`.
It is enough to inherit `AbstractReflection` (using `alias_candidate`
only).

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