[Cython] cython doesn't compile cdef'd variables of type set?

[Thomas Keller]

This may be a foolish question, but I'm still getting used to to
Cython. I was under the impression that you can cdef all the basic
python types like list, dict,tuple etc. However, when I try to cdef variables
of type set, Cython gives a compile error. Is it simply unsupported at
this time or am I completely missing something? I imagine either way
it wouldn't speed things up that much.
Regards,
Thomas Keller