Re: Performance of the compiler
I am not going to cache ClassNode instance(just cache class names,
which are `String`), but I want to add a check whether the name of the
ClassNode being resolved is possibly in the default imported packages, e.g.
If a ClassNode instance's name is `Foobar`(apparently it could not be in any
default imported packages), then we can `return false` immediately and the
further resolving can be eliminated.
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