The end index of the change.
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.
If ChangeType
is insert
this is
the value of the inserted string.
If ChangeType
is remove this is the
value of the removed substring.
The changed args object which is emitted by an observable string.