tensorProductCoordinates does not allow coords with different number of x and y coordinates

I tried to construct a grid with a different number of x and y coordinates using tensorProductCoordinates from dune-grid/python/dune/grid/_grids.py. I received the following error message:

Traceback (most recent call last):
  File "/home/streitfl/Schreibtisch/Dune/build/dune-hypercut/examples/anisotrop/simulations_advection.py", line 316, in <module>
    advTestCase = AdvTestCase((50, 2), 0.4, boundaryValues)
  File "/home/streitfl/Schreibtisch/Dune/build/dune-hypercut/examples/anisotrop/simulations_advection.py", line 98, in __init__
    domain = domains.AnisotropInX(**cfg)
  File "/home/streitfl/Schreibtisch/Dune/dune-hypercut/python/pyhypercut/domains.py", line 209, in __init__
    BaseAnisotrop.__init__(self, cells, lowerLeft, upperRight, refinements, alpha, 0.)
  File "/home/streitfl/Schreibtisch/Dune/dune-hypercut/python/pyhypercut/domains.py", line 138, in __init__
    view = gridView(tensorProductCoordinates(coordinates, lowerLeft), dimgrid=2)
  File "/home/streitfl/Schreibtisch/Dune/build/dune-grid/python/dune/grid/_grids.py", line 160, in tensorProductCoordinates
    coords = np.array(coords, dtype=dtype)
ValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.

The variable coordinates in the above error message is a list containing two arrays of different sizes.