A concrete implementation of [[IObservableString]]
Construct a new observable string.
A signal emitted when the string has changed.
Test whether the string has been disposed.
Get the value of the string.
Set the value of the string.
The type of the Observable.
Set the ObservableString to an empty string.
Dispose of the resources held by the string.
Insert a substring.
The starting index.
The substring to insert.
Optional
Remove a substring.
The ending index.
A concrete implementation of [[IObservableString]]