{ArrayType} *output = array;

  if (!allocator || !array) {{
    goto RETURN_{Tupper}_ARRAY_APPEND_ALLOC;
  }}

  if (array->count >= array->capacity) {{
    u64 new_capacity = wapp_misc_utils_u64_round_up_pow2(array->capacity * 2);
    output           = ({ArrayType} *)_array_alloc_capacity(allocator, new_capacity, array->item_size);
    if (!output) {{
      output = array;
      goto RETURN_{Tupper}_ARRAY_APPEND_ALLOC;
    }}
    wapp_{Tlower}_array_copy_capped(array, output);
  }}

  wapp_{Tlower}_array_append_capped(output, item);

RETURN_{Tupper}_ARRAY_APPEND_ALLOC:
  return output;