#15303: Coercion discovery fails to be transitive
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Reporter: nbruin | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.13
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: N/A | Work issues: Implement
Branch: | backtracking properly
u/SimonKing/ticket/15303 | Commit:
Dependencies: #14711 | 74821fe5409c3104b5d6eb7407a8287d54170df9
| Stopgaps:
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Comment (by SimonKing):
I think the following is both reasonable and reasonably close to the
status quo:
- if `_coerce_map_from_` returns a map, then we trust that it is a good
choice.
- if `_coerce_map_from_` returns True, then we do not necessarily trust
that `self._generic_convert_map(S)` is the best choice. So, we test if
backtracking yields anything better.
I found a couple of cases in which `_coerce_map_from_` returned
`_generic_convert_map` (e.g. for `CC`!). It seems to me that one should
return `True` instead.
--
Ticket URL: <http://trac.sagemath.org/ticket/15303#comment:53>
Sage <http://www.sagemath.org>
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