assert that the value of self.mu is integral instead of checking the type

Author: nchristensen

ConfigSpace/hyperparameters.pyx

@@ -1715,7 +1715,7 @@ cdef class NormalIntegerHyperparameter(IntegerHyperparameter):
         self.mu = mu
         self.sigma = sigma
         if self.sigma == 0:
-            assert isinstance(self.mu, int)
+            assert int(self.mu) == self.mu
 
         if default_value is not None:
             default_value = self.check_int(default_value, self.name)