Function issue (lowercase)

[doasync]

function is not primitive so you should definitely return 'Function' instead

[doasync]

Related with #102 and #103

[meeber]

I could go either way with this one. On the one hand, typeof someFn === "function". On the other hand, it seems to be type-detect's mission to be consistent with itself rather than consistent with the oft-inconsistent ECMAScript.