Appender enlarge

[burner]

private void enlarge(size_t sz) {
    allocator.expandArray(arr, sz);
}

https://dlang.org/phobos/std_experimental_allocator.html#.expandArray

expandArray does what you implemented in enlarge. Maybe even remove enlarge all together.

[lodo1995]

You're right. I don't know why I didn't use it in the first place. I'll fix it. The method will remain, as it also contains the logic to decide the expansion factor.

[burner]

No problem, sometimes you/me/everybody just misses stuff.

[burner]

+1