nl_tokens: ES6 draft 07 - 15 - 13 section 15 . 4 . 3 . 24
pl_tokens: function ArrayFindIndex ( predicate , thisArg ) { CHECK_OBJECT_COERCIBLE ( this , "Array.prototype.findIndex" ) ; var array = TO_OBJECT ( this ) ; var <mask> = TO_INTEGER ( array . length ) ; return InnerArrayFindIndex ( predicate , thisArg , array , length ) ; }