@:value(cast 1)@:impl@:enuminlineread onlyAssociatedAlpha:ExtraSamples = 1
@:value(cast 2)@:impl@:enuminlineread onlyUnassociatedAlpha:ExtraSamples = 2
@:value(cast 0)@:impl@:enuminlineread onlyUnspecified:ExtraSamples = 0