code: func GrowIntSlice(arr []int, minSize int) []int {
  	assert2(minSize >= 0, "size must be positive (got %v): likely integer overflow?", minSize)
  	if len(arr) < minSize {
  		newArr := make([]int, Oversize(minSize, NUM_BYTES_INT))
  		copy(newArr, arr)
  		return newArr
  	}
  	return arr
  }
docs: // L285