deopt
De-optionalize a call to a function or constructor
// deopt a function:var add = // then call it with an options hashconsole // It even work on "class" constructors when// they begin with a capital letter. { thisa = a thisb = b} Thingprototype { return thisa + thisb} var Thang = var thing = consoleconsole // Provide a callback and do something with the result before// returning it. Thang =