[MPEG-OTSPEC] revised B64K glyf table: new tag "LOCX" and "GLYX"

[suzuki toshiya]

Dear Liam,

You proposed "LOCX" and "GLYX" as the tags for
the new implementations. The tags "LOCX" and
"GLYX" are natural for the proposed extension.
I appreciate.

But according to a header file of GhostScript/GhostPDL,

https://github.com/ArtifexSoftware/ghostpdl/blob/master/devices/gxfcopy.h

I have a concern that "gdir", "locx," and "glyx"
might have been used in some PostScript documents
to emit the TrueType font for the generation of PDF.

Even if "locx" and "glyx" were once used, the
difference between lowercase/uppercase is
sufficient to avoid confusion?

I wish Adobe experts could check whether old
versions of AdobePS printer drivers used them
for their internal use.

Regards,
mpsuzuki