Files changed (4)
-The `Keywords` and `Cc` fields offer some special list management features. The new field value can consist of multiple items (i.e. multiple keywords or cc addresses).
-|| alice, bob || -alice, +carol || bob, carol || Remove existing item and append additional item. ||
-|| alice || bob, +carol || bob, carol || Replace item with different item, then add additional item. ||
-|| alice || bob, -alice || bob || Replace item with different item, then ignore item to be removed, as it was already replaced. ||