• Implement hashing and comparison.
• Make TestSuite pass all tests.

See also meta ticket #21202.

Depends on #21325
Depends on #21336

CC: @galipnik

Component: combinatorics

Author: Daniel Krenn

Branch/Commit: a7ecb88

Reviewer: Clemens Heuberger

Issue created by migration from https://trac.sagemath.org/ticket/21319