Zarr non-uniform axis values

[manthey]

When a zarr sink has non uniform axis values, I was expecting the top-level metadata for the axis values to still have one entry per axis position. That is, in the test file written here https://github.com/girder/large_image/blob/master/test/test_sink.py#L734, metadata['ValueT'] is {'values': [10.0, 10.0, 10.0, 20.0, 20.0, 20.0, 30.0, 30.0, 30.0, 10.01, 10.01, 10.01, 20.01, 20.01, 20.01, 30.01, 30.01, 30.01, 10.02, 10.02, 10.02, 20.02, 20.02, 20.02, 30.02, 30.02, 30.02, 10.03, 10.03, 10.03, 20.03, 20.03, 20.03, 30.03, 30.03, 30.03], 'uniform': False, 'units': 'millisecond', 'min': 10.0, 'max': 30.03, 'datatype': 'float64'}.

Individual frames have distinct T values, but I was expecting metadata['ValueT']['values'] to have 3 values which would be some value from where t==0, 1, 2 (e.g., [10.0, 20.00, 30.0] or [10.03, 20.03, 30.03]). Otherwise, to use the top level values we have to check if the uniform flag is set and then access the values different depending on it.