code: function processThunkArgs( args ) {
      let length = args.length | 0;
  
      if( length >= 3 ) {
          let res = new Array( --length );
  
          for( let i = 0; i < length; ) {
              res[i] = args[++i]; //It's a good thing this isn't undefined behavior in JavaScript
          }
  
          return res;
      }
  
      return args[1];
  }
docs: This is separated out so it can be optimized independently to the calling function.