is there a term for the functions, which are the values of the :enter/`:leave`/`:error` keys of an interceptor?
is it an enter handler of an interceptor, for example?
or the enter transform(er) of an interceptor?
or an on-enter function of an interceptor?
I'm not sure that I've seen a globally "idiomatic" term, I've seen/used both "enter handler" and "on-enter function" in conversation