Provide public unsafe EntityRef::get_change_ticks_by_id that takes ComponentId

[sQu1rr]

What problem does this solve or what need does it fill?

I need to get the change ticks on the type-erased component for some entities. Basically EnitityRef::get_change_ticks but with ComponentId instead of T. I currently use the modified get_ticks function. My use-case is identifying all entities with changed components, and serializing these components, hence I cannot know the component type in advance.

What solution would you like?

Solution is to define (unsafe?) public get_chage_ticks_by_id() that takes ComponentId instead of T. It should ideally be implemented for both EntityRef and EntityMut for consistency.

What alternative(s) have you considered?

There is already a get_ticks_with_type function that is pub(crate). One solution would be to make it public.

Another solution would be to make get_ticks public.

[jakobhellermann]

I don't see why such a function would be unsafe, it just needs to return nothing when the component ID doesn't exist on the entity.

[sQu1rr]

You are right it shouldn't. I hastily concluded it should be unsafe when saw that the internal functions are unsafe e.g. get_ticks_with_type

I will start working on a PR