#4740: avoid creating unneeded homsets when coercing
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Reporter: mabshoff | Owner: robertwb
Type: defect | Status: needs_info
Priority: major | Milestone: sage-5.11
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Mike Hansen | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Changes (by SimonKing):
* status: needs_work => needs_info
Comment:
I see two potential solutions, and the "info" I am seeking is: What would
you prefer.
We could
1. Let `F.coerce_map_from(F)` use the cache (I think this is what I would
prefer).
2. Let `F.coerce(x)` avoid creating a morphism, if the parent of x is F.
It might even make sense to do both, the latter for efficiency.
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Ticket URL: <http://trac.sagemath.org/ticket/4740#comment:19>
Sage <http://www.sagemath.org>
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