We have had various proposals of ideas for features that require cell-level metadata. We should make sure we iron out a mechanism by which these can be added prior to 0.13 release, so we reduce the likelihood of needing to rev the nbformat for 0.14. I imagine simply attaching a simple black-box metadata dict to each cell (and probably worksheet) like is already on the notebook as a whole would be sufficient. They can obviously start out as empty since we don't have any content yet.
Related: I believe the recent js merge removed 'collapsed' from the saved data (It's started disappearing when I re-save notebooks). If we do want to keep storing collapsed, it probably belongs in this md dict.
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