Comparison in test_index.py::IndexSerialization::test_interleaving sometimes fails

[mwtoews]

It seems that tests/test_index.py::IndexSerialization::test_interleaving sometimes fails:

  >       assert all(
              all(np.allclose(a, b) for a, b in zip(L, E))
              for L, E in zip(leaves, expected)
          )
...
  x = array([ 2, 92, 51, 55, 26, 95,  7, 81, 38, 22, 58, 89, 91, 83, 98, 37, 70,
         31, 49, 34, 11,  6, 13,  3, 23, 57, ... 54, 88, 72, 97, 60, 62, 48, 19,
         25, 76, 59, 66, 64, 79, 94, 40, 32, 46, 47, 15, 68, 10,  0, 80, 56,
         50])
  y = array([ 2., 92., 51., 55., 26., 95.,  7., 81., 38., 22., 58., 89., 91.,
         83., 98., 37., 70., 31., 49., 34., 11.,...48., 19., 25.,
         76., 59., 66., 64., 79., 94., 40., 32., 46., 47., 15., 68., 10.,
          0., 80., 56., 50., 30.])
  Error: Command ['sh', '-c', 'pytest -v /project/tests'] failed with code 1. 
  atol = 1e-08, rtol = 1e-05
  
  
      def within_tol(x, y, atol, rtol):
          with errstate(invalid='ignore'):
  >           return less_equal(abs(x-y), atol + rtol * abs(y))
  E           ValueError: operands could not be broadcast together with shapes (69,) (70,)

looking at the test data, it should have size 70, so for some reason leaves misses the last element 30. Curious to see if this this issue is valid or intermittent. I can't replicate it locally.

Originally posted by @mwtoews in #227 (comment)

[mwtoews]

I suspect this is a 32-bit issue, as this only happens with "CPython 3.7 manylinux i686"