.. todo:: UI access to block (and curve?) info dicts. Someone should
make a tree-based object browser ;).
+.. todo:: Playlists currently drop all :class:`~hooke.curve.Data`
+ instances when they are unloaded, so you can't extract the fitted
+ parameters from unloaded curves. We'll need a way to export chosen
+ curve attributes to file.
+
Command stacks
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