#7421: Weaker precondition for registering a new coercion.
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Reporter: nthiery | Owner: robertwb
Type: enhancement | Status: needs_review
Priority: blocker | Milestone: sage-4.2.1
Component: coercion | Keywords: coercion
Work_issues: | Author: Nicolas M. Thiéry
Reviewer: Robert Bradshaw | Merged:
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Comment(by robertwb):
There is one way this can go wrong. Suppose one has B -> C, and one wants
to register A -> B. If A -> C was previously requested, its non-existence
will be cached.
Now I don't think this will be an issue in practice, nor does
{{{_unset_coercions_used}}} solve it.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7421#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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