Returns a Boolean value that indicates whether a given character is in the receiver.
Original signature is '- (BOOL)characterIsMember:(unichar)aCharacter'
Available in Mac OS X v10.0 and later.


- aCharacter (Char)
- The character to test for membership of the receiver.

YES if aCharacter is in the receiving character set, otherwise NO.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)