Curve and its descendants seem to lack the usual copy and clone functions, is there a reason for that?
Also: How difficult would it be to implement those?
There is no particular reason for this. I guess there was never a feature request for copying/cloning curve objects.
The implementation should be fairly easy…i think.
Excellent, thanks for the reply 
Is this still in development? Curves: Prepare serialization #11599
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I’ve closed the PR because it was not merged within several month. If you are interested in this feature, then please post a comment at github.
I personally think that enabling serialization and providing copy() and clone() methods makes the curve entities more consistent to the rest of the library.
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Curve and all entities in the extras/curves directory now have .copy() and .clone() methods. Yay! 
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That’s awesome! 