Having the JSON library return JS arrays as CL vectors by default is the only correct way; false and nil also have distinct values by default. Glad to see they

Having the JSON library return JS arrays as CL vectors by default is the only correct way; false and nil also have distinct values by default. Glad to see they didn't mess that up. OTOH it aliases the UIOP/FILESYSTEM package to FILESYSTEM, and what functions are in UIOP/FILESYSTEM is an implementation detail that is free to change from version to version...