-------concat Small-------------
- concat 101, 102, 103, 104, 105
length: 2147483647
  2147483641: 100
  2147483642: 101
  2147483643: 102
  2147483644: 103
  2147483645: 104
  2147483646: 105
- arr.concat(arr)
length: 4294967294
  2147483641: 100
  2147483642: 101
  2147483643: 102
  2147483644: 103
  2147483645: 104
  2147483646: 105
  4294967288: 100
  4294967289: 101
  4294967290: 102
  4294967291: 103
  4294967292: 104
  4294967293: 105
-------test prototype lookup-------------
a: 200,101,202,203,204,105,106,207
r: 200,101,202,203,204,105,106,207,300,301,302,303,304
r: 200,101,202,203,204,105,106,207,108,301,302,303,304
r: 200,101,202,203,204,105,106,207,,301,302,303,304