This is technically a API change but since pointerOrder always contained 0 and was unused (or maybe used by some super-old parser 15 years back), it doesn't really matter (no g-p plugin uses this field).
Its an API addition so bump it, increasing APIs is no problem, the previous field was uncommented so it _should_ not have been used by plugins and its not an ABI change so long as it remains the same field type.