Invoked by setValue:forKey: when it’s given a nil value for a scalar value (such as an int or float).
Original signature is '- (void)setNilValueForKey:(NSString *)key'
Available in Mac OS X v10.3 and later.


- key (NSString)
- The name of one of the receiver's properties.

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