[glibmm-2.4] Binding: cleanups re SlotTypeTransform/docs, basic test, a nano-optimisation
These can be split if anyone would like, as they are based on each other; I just submit one MR for ease (laziness?)
Edited by Daniel Boles
These can be split if anyone would like, as they are based on each other; I just submit one MR for ease (laziness?)