Modulo operator

[MariusDoe]

In KoanAboutCollectionProtocol, test04select includes

self assert: {2 . 4 . 6} equals: ({1 . 2 . 3 . 4 . 5 . 6} select: xx)

This to me looks like [:aNumber | aNumber \\ 2 = 0] or similar. However, \\ as the modulo operator is rather unusual compared to other programming languages the students might already know (most use %, mod or similar). Maybe a hint regarding the operator could be added?

If looking for the operator in Number or SmallInteger as part of the solution finding process is intended, I'm happy to close.