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Primitive type 19 (DI_PT_QUADLIST, 0x13) is used by Unity and other engines for UI quads, sprites and font glyphs. Because Vulkan lacks native quad-list primitive topology, quad draws are expanded on the CPU into indexed triangle lists with 6 indices per 4-vertex quad, respecting the first/last provoking vertex configuration and discarding incomplete trailing vertices. Adds unit tests and documents the functional debt.