Fix issue 14082 -- RedBlackTree unittest fails with custom predicate less #2936
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https://issues.dlang.org/show_bug.cgi?id=14082
The red black tree unit tests are template-based, so they instantiate based on the parameters to the template. Previously, the only consideration was that the type should be integral. If someone created a Red Black Tree with a custom lambda, it still tries to run the unit test with the assumption that it's "a > b". This precludes that.