Function uncurryThis

ses.cjs:331–333

(fn)

// uses the other technique.
const uncurryThis=
  (fn)=>
  (receiver, ...args)=>
    apply(fn, receiver, args);
const arrayPush=  uncurryThis(Array.prototype.push);
const arrayIncludes=  uncurryThis(Array.prototype.includes);
const stringSplit=  uncurryThis(String.prototype.split);