John Hudson wrote: > but it should *not* be encoded as U+0000 or as any other codepoint. > .notdef should be unencoded.
Almost. OpenType specifies that there is no functional difference between a code point that is not mapped and a code point that is explicitly mapped to GID 0, so there is never a need to map any code point to GID 0. But at the same time, there is no prohibition against mapping explicitly a code point to GID 0. Eric.
