Comment 5 for bug 132924

From the README file:
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Additional letters

The encoding of the fonts is based on the model of the Cyrillic Asian
encoding. The Russian alphabet occupies the place of
the Latin-1 supplement in the Western (Windows CP 1252) encoding and its
own Unicode positions in the Cyrillic (CP 1251) encoding. Additional
Uralic letters can be found in three places - instead of additional
characters in the Western encoding, instead of additional characters in
the Cyrillic encoding and in their own Unicode positions (with the
exceptions of those letters that are not found in this standard).
Existing Mari and Udmurt fonts were taken into consideration while
distributing positions, but incorporating their encodings did not prove
possible. Eventually, Udmurt fonts were used as the starting point. See
the test page for details.

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These fonts are for Uralic languages only! So, don't use these fonts for any other purpose.
I will nevertheless contact upstream and propose a fix. IMHO the fonts have been wrongfully encoded and are therefor broken. Even when used in a Unicode environment, additional Cyrillic characaters should only show up in the U+00A0 - U+00BF range. At least, that's the mapping of CP1251 to Unicode.