- Most of the usages of 'release' are temporary here, but a few will
likely need to stay. In these cases, the existing behaviour is
retained. To fix all usages, smart pointers would need to be used all
throughout the tree
- The freecad_cast looks awkward now. I haven't added a new version that
works with smart pointers because it's not clear what the right
ownership semantics would be. Make the caller be explicit for now.
timpieces
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