#14711: Weak references in the coercion graph
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Reporter: jpflori | Owner: davidloeffler
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-6.1
Component: number fields | Resolution:
Keywords: memleak, number | Merged in:
field, QuadraticField | Reviewers: Jean-Pierre Flori
Authors: Simon King | Work issues:
Report Upstream: N/A | Commit:
Branch: | 0af59ea93689cb6abb9d3fae0f1cf11f2aee5cca
u/jpflori/ticket/14711 | Stopgaps:
Dependencies: |
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Comment (by tscrim):
My 2 cents. I don't think that `coerce_map_from()` should return the map
which is used in the coercion system, but a copy of it. I believe this
would be a better system since it's easily accessible to a user, so the
user could mess with the map and the coercion system, and the result is
used in error messages where the "copy" warning message has no purpose
(for example the doctest in `ncsym/dual.py`). Subsequently I believe we
should have a hidden function which returns the actual map, for those
cases when one needs it.
Also couldn't we use (some form of) #8878 get around some of the
backtracking issues?
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Ticket URL: <http://trac.sagemath.org/ticket/14711#comment:171>
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