I just discovered a bug in some of my code, mangling its arguments. The
fix would be to deepcopy the argument before working with it. But
deepcopy fails (minimal test case):
sage: f = function('f', x)
sage: p = piecewise([[(0,1),f]])
sage: deepcopy(p.list())
...
RuntimeError: unknown function 'f' in archive
Anyone hit this before?
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