The 2-category of categories #526
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This purely internal changes simplifies the code slightly.
For the case of natural transformations where the domain category is finitely presented.
Besides the fact that the asterisk is a more standard notation for horizontal composition of natural transformations (used, for example, Riehl's textbook), this change also gives the horizontal composition in the double category of V-matrices, which is generalized matrix multiplication, the same notation as ordinary matrix multiplication in Julia. This double category is not yet implemented, however.
Whiskering a special case of horizontal composition (and vice versa) but it's useful to have dedicated methods for it.
A trivial, yet useful, special case.
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I have changed my mind about this again, but as the diff shows, this change leads to a considerable reduction of code duplication or near-duplication.
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Preliminary implementation with focus on functors and natural transformations out of finitely presented categories.