#11900: Serious regression caused by #9138
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Reporter: SimonKing
| Owner: tbd
Type: defect
| Status: needs_work
Priority: critical
| Milestone: sage-4.8
Component: performance
| Keywords: categories regression
Work_issues: Laurent series rings are fields. Add docs. Don't use is_ring and
friends | Upstream: N/A
Reviewer: Jeroen Demeyer, Nicolas M. Thiéry
| Author: Simon King
Merged:
| Dependencies: #9138 #11911
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Comment(by SimonKing):
I'd of course appreciate your answer to my questions, but here is how I
would answer:
Replying to [comment:125 SimonKing]:
> * Do we want to allow for subclasses?
We don't. Subclassing a singleton means that it is not a singleton.
> If we don't, shall the attempt to create a subclass of a subclass of
Category_singleton result in an error?
I think a big fat warning in the docs should be enough.
> * Should the attempt to do `Category_singleton()` result in an error?
Namely, this would destroy ''all'' attempts to create a new singleton
category in that session.
It might be reasonable.
> * Do we want that `EnumeratedSets` is a singleton? Then de Bruijn
sequences have to change.
I think we do want that enumerated sets form a singleton. I really don't
see why de Bruijn sequences are not simply copying the `_call_` method
from the enumerated sets.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:126>
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