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The current implementation of data frame metadata using the
df.attrs
semi-functionality in pandas is useful, but it has a bug/decision that produces an exception when doing dataframe concatenations because some of the metadata is kept as a list. This PR changes the table metadata format to split x/y/z into different fields, similar to how it's actually kept and transmitted. This is a mild breaking change for those who use thevoxel_resolution
field right now (e.g. dash apps will need a one line fix in a few places), but I think it's useful to avoid a fairly cryptic error.