export determineActualTypes

[davidchambers]

There are contexts outside sanctuary-def in which one may wish to determine the types of a value. In silly-goat, for example, we would like to be able to have the 🐐 respond with a value and the types of which the value is a member. For example:

@davidchambers:

@silly-goat

S.on(S.concat, S.of(Array), 'foo', 'bar')

@silly-goat

["foo", "bar"] :: Array String, Pair String String

We should export determineActualTypes to make this possible.