This adapter takes some untyped arguments, and returns an untyped result. Internally, it applies the invoker to the target, which causes the objects to be unboxed; the result is a raw type in L/I/J/F/D. This result is passed to convert, which is responsible for converting the raw result into a boxed object. The invoker is kept separate from the target because it can be generated once per type erasure family, and reused across adapters.
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