illegal state exception on Maybe.ap() invocation with null returning function

[olivr70]

hello

I am really new to the monad universe, and in fact using Monet.js to explore it.

I stumbled on an "Illegal state exception" while running

function nullFunc() { return null }
Some("a").ap(Some(nullFunc)); // throws "Illegal state exception" from Maybe.fn.Maybe.init

The problem seems to come from the fact that the map function listed hereafter composer _this.of_ with fn (my nullFunc).

Looking though the spec I did not see any requirement that ap() should be passed a non-null returning function. Did I miss something

Why use this.of and not this.fromNull in map ?

var map = function (fn) {
        return this.bind(this.of.compose(fn))
    }

Sorry I didn't proposed the PR, but I have miles to cover and the subject before

[ulfryk]

It is proper behaviour actually -- see discussion here: https://github.com/cwmyers/monet.js/issues/53