versions/0.2.2/oj.js
function _v(fn, n, v, type){
    n = {1:'first',2:'second',3: 'third', 4: 'fourth'}[n]
    _a(!type || (typeof v === type), fn, "" + type + " expected for " + n + " argument")
  }
function _v(fn, n, v, type){
    n = {1:'first',2:'second',3: 'third', 4: 'fourth'}[n]
    _a(!type || (typeof v === type), fn, "" + type + " expected for " + n + " argument")
  }
_v: validate argument n with fn name and message