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The current definition of Constant.unapply is unsound because there is no way to tests if the constant contains a
Type
.We added
Constant.ClassTag.unapply
to work around this limitation, but the original was still unsound.That definition has it's own design flaws.
To properly match all constants we provide an extractor for each kind of constant.
This has the added advantage of being able to scale if new constants are added later.
We also rename
Constant.ClassTag
toClassOf
as it represent aclassOf[T]
.