Sometimes in the drawing pipeline, we have to perform math on path coordinates, even after
the path is in device-coordinates. Tessellation and clipping are two examples. Usually this
is pretty modest, but it can involve subtracting/adding coordinates, or multiplying by
small constants (e.g. 2,3,4). To try to preflight issues where these optionations could turn
finite path values into infinities (or NaNs), we allow the upper drawing code to reject
the path if its bounds (in device coordinates) is too close to max float.