Returns the object returned by mutableCopyWithZone: where the zone is nil.
Original signature is '- (id)mutableCopy'
Available in Mac OS X v10.0 and later.
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The object returned by the NSMutableCopying protocol method mutableCopyWithZone:, where the zone is nil.
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- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)