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m = om.TriMesh()
for _ in range(4):
    m.add_vertex(np.random.rand(3))

m.set_vertex_property_array('test', [1,2,3,4]) # doesn't work (fails silently)
m.vertex_property_array('test') # fails here

m.set_vertex_property_array('test', [[1],[2],[3],[4]]) # this works

The first set_vertex_property_array call should also work and set a property that assigns a scalar to every vertex.