forceAndCall

forceAndCall calls the function FUN with arguments specified in …. If the value of FUN is a closure then the first n arguments to the function are evaluated (i.e. their delayed evaluation promises are forced) before executing the function body. If the value of FUN is a primitive then the call FUN(…) is evaluated in the usual way. forceAndCall is intended to help defining higher order functions like apply to behave more reasonably when the result returned by the function applied is a closure that captured its arguments.