Possibility to add a function to an app, which can handle conflict resolution.

For example, you may want to handle conflicts differently for strings.

Say a field has a value:
Ducks
Geese

Person A makes a change:
Ducks
Geese
Oranges

Person B later makes a change from the original to
Ducks
Geese
Bananas

You may want to instead just append Bananas to Person A's change rather than replace it. Resulting to:
Ducks
Geese
Oranges
Bananas

Instead of the behaviour now which would just give:
Ducks
Geese
Bananas