The changed args object which is emitted by an observable string.
The end index of the change.
Optional
The starting index of the change.
The type of change undergone by the list.
The value of the change.
If ChangeType is set, then this is the new value of the string.
ChangeType
set
If ChangeType is insert this is the value of the inserted string.
insert
If ChangeType is remove this is the value of the removed substring.
The changed args object which is emitted by an observable string.