[XeTeX] new use of alternate glyphs and how to turn them off

[Andy Lin]

I've been seeing something different altogether. In addition to
activating +calt by default, it also gives some strange output when
using stylistic sets in Gabriola. I've attached 2 images:
tl2010gabriola shows the behaviour with tl2010 (I just installed
today), miktex28gabriola shows the correct output using MiKTeX2.8

\font\gab="Gabriola:+ss04" at 60pt %+ss04,+calt for MiKTeX
\gab flying dogstarman
\bye

These are the version lines from each log file.
This is XeTeX, Version 3.1415926-2.2-0.9997.4 (Web2C 2010)
(format=xetex 2010.10.17)
This is XeTeX, Version 3.1415926-2.2-0.9995.1 (MiKTeX 2.8) (preloaded
format=xetex 2010.10.17)

Any thoughts as to how this would happen?

-Andy
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