[XeTeX] Gentium Book / Book Basic + TeX Ligatures = memory leak

[Akira Kakuto]

Dear Simon,

> \setmainfont{Gentium Basic:Ligatures=TeX} % Slow

It shows that the syntax is incorrect in the log file:

Unknown feature `Ligatures=TeX' in font `Gentium Basic'.
Unknown feature `Ligatures=TeX/OT' in font `Gentium Basic'.
Unknown feature `Ligatures=TeX/BI/OT' in font `Gentium Basic'.
Unknown feature `Ligatures=TeX/B/OT' in font `Gentium Basic'.
Unknown feature `Ligatures=TeX/I/OT' in font `Gentium Basic'.

But it should not be slow.
It may be a bug, which will hopefully be fixed by Khaled.

Best,
Akira