tryRemoveKey
tryRemoveKey(keys: KeyType): MemberType, lockReceiver, updating;
The tryRemoveKey method of the ExtKeyDictionary class attempts to remove an item with a specified key from a dictionary if it is present.
This method returns the MemberType value if an object with the specified key was successfully removed; otherwise it returns null.
No subclass of the RootSchema Dictionary class allows the insertion of a null object reference.
2020.0.01 and higher
