code: func parseInt(bytes []byte) (v int64, ok bool, overflow bool) {
  	if len(bytes) == 0 {
  		return 0, false, false
  	}
  
  	var neg bool = false
  	if bytes[0] == '-' {
  		neg = true
  		bytes = bytes[1:]
  	}
  
  	var b int64 = 0
  	for _, c := range bytes {
  		if c >= '0' && c <= '9' {
  			b = (10 * v) + int64(c-'0')
  		} else {
  			return 0, false, false
  		}
  		if overflow = (b < v); overflow {
  			break
  		}
  		v = b
  	}
  
  	if overflow {
  		if neg && bio.Equal(bytes, []byte(minInt64)) {
  			return b, true, false
  		}
  		return 0, false, true
  	}
  
  	if neg {
  		return -v, true, false
  	} else {
  		return v, true, false
  	}
  }
docs: // About 2x faster then strconv.ParseInt because it only supports base 10, which is enough for JSON