[racket] can a PLaneT package specify an upper bound for Racket version?

[Danny Yoo]

I'm defining a required-core-version on Moby since it requires Racket
5.0.1 and parts of the compiler depend on its particular bytecodes.
However, I'm assuming that when a newer version of Racket comes out
that the bytecodes may change.  Is there a way to specify an upper
bound on a PLaneT package?
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