subdomain_id fails with various dtypes

When using various dtypes for subdomain_id, tabulate_tensor() is still correctly generated but create_cell_integral() omits the case. MWE:

import numpy
c = Constant(interval)
#L = c*dx(42)             # works
#L = c*dx(numpy.int(42))  # works
L = c*dx(numpy.intc(42))  # fails; as well as many other dtypes

Might not be relevant in FFCX but it might turn out that the bug boils down to UFL.

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