[tex-hyphen] Puzzling hyphenation with polyglossia and xelatex

[Dominik Wujastyk]

Minimal example, run with xelatex and TeXlive 2010:

\documentclass{article}
\usepackage{polyglossia}
\begin{document}
\showhyphens{helicopter}
\end{document}


Why does my log file show

Underfull \hbox (badness 10000) in paragraph at lines 4--4
[] \EU1/lmr/m/n/10 helicopter

instead of

Underfull \hbox (badness 10000) in paragraph at lines 4--4
[] \OT1/cmr/m/n/10 he-li-copter

I'm not worried about default fonts or encodings, but the hyphenation.

Best, and thanks in advance,
Dominik
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