#18026: Parent breakage because not every SageObject is idempotent
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: pickling | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by vbraun):
IMHO that is one of the implicit promises of the parent/element pattern:
Cast to the current parent gives you the same element `e.parent()(e) ==
e`. E.g. the definition of `e in e.parent()` is along those lines. If you
violate that then you'll run into places where that assumption was
implicitly made, for example `Sequence()`.
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Ticket URL: <http://trac.sagemath.org/ticket/18026#comment:6>
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