function.length is certainy a PITA dus to the `arguments` issue that was mentioned. In particular, function.length doesn't work on functions returned by our own

function.length is certainy a PITA dus to the `arguments` issue that was mentioned. In particular, function.length doesn't work on functions returned by our own combinators, a big no-no! In the end I adopted a convention where every function that depends on the number of arguments of something else receives that number sa a first parameter: maybe(2, function(a,b){ ... })