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`Erasure.boxingErasure` exists to ensure that we use boxed primitives
to represent the value, if the value class has type parameters
referred to by its element type.
However, this is implenented with a type map that runs deeply
across the type. In the enclosed test case, we have
`Repr=Array[Int]`, which should be erased to `Array[Int]`, _not_
to `Array[Integer]`.
This commit ensures that the `boxingErasure` map only applies
boxing at the top level, and not within array arguments. (Other
type arguments will be erased, so we don't have to deal with them.)
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