Given that the `NativeImageDecoder.{isSupported, isDecodable}` methods require both dictionary lookups *and* ColorSpace parsing, in hindsight it actually seems more reasonable to the `JpegStream.maybeValidDimensions` checks *first*.
Given that the `NativeImageDecoder.{isSupported, isDecodable}` methods require both dictionary lookups *and* ColorSpace parsing, in hindsight it actually seems more reasonable to the `JpegStream.maybeValidDimensions` checks *first*.