mutable poset: remove default for breaking ties in topological sort

[dkrenn]

At the moment shells_topological of a mutable poset breaks ties by means of repr by default. However, mutable poset is a data structure and should not do this expensive operation by default, therefore this default should be removed which is the aim of this ticket.

Note that this default was in mainly due to convenience reasons to have the results in the doctests always in the same order.

(Motivation: For my code/application, this improves the computation time by more than a factor 2.)

CC: @behackl

Component: asymptotic expansions

Author: Daniel Krenn

Branch/Commit: fd98fc1

Reviewer: Benjamin Hackl

Issue created by migration from https://trac.sagemath.org/ticket/26526

[dkrenn]

Branch: u/dkrenn/repr-default-topological

[dkrenn]

Commit: fd98fc1

[dkrenn]

New commits:

fd98fc1

Trac #26526: remove default "repr" for topological sorting

[dkrenn]

Author: Daniel Krenn

[behackl]

Reviewer: Benjamin Hackl

[behackl]

comment:3

I looked through the changes and they look good to me overall.

Would it make sense to add another doctest (possibly with output marked as random) where no key is passed and thus no sorting happens?

[dkrenn]

comment:4

Replying to @behackl:

Would it make sense to add another doctest (possibly with output marked as random) where no key is passed and thus no sorting happens?

I do not see much of a point adding such a test.

[behackl]

comment:5

Replying to @dkrenn:

Replying to @behackl:

Would it make sense to add another doctest (possibly with output marked as random) where no key is passed and thus no sorting happens?

I do not see much of a point adding such a test.

I was thinking about testing whether calling the method without a key still works -- but you are right, I also cannot think of a usecase for that.

Good to go.

[vbraun]

Changed branch from u/dkrenn/repr-default-topological to fd98fc1