Hi! Homsets are used whenever a coercion or conversion map is involved, hence, they are uniquitous in Sage and should thus be fast. Before I try to convert homset.py into homset.pyx, I'd like to ask, because I suppose people have already tried to make it Cython: Is there a reason why the transition to Cython should be difficult? Note that @lazy_attribute and @cached_method became available to .pyx files, if I am not mistaken. So, if such decorators where the only original reason to use Python, then I certainly think one should try Cython now.
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