[WIP] Add component-level dirty/changed flags - #291

Unboxing a possibly null value.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference assignment.

There is no defined ordering between fields in multiple declarations of partial struct 'QueryDescription'. To specify an ordering, all instance fields must be in the same declaration.