These constants are used as components in a bitfield to specify the behavior of NSAllocateCollectable and NSReallocateCollectable.
var NSScannedOption: Int
Specifies allocation of scanned memory.
var NSCollectorDisabledOption: Int
Specifies that the block is retained, and therefore ineligible for collection. Specifying this option is equivalent to invoking disableCollectorForPointer: with the returned block as the argument.