Looks like a bug with Cyrillic character highlighting. I'm guessing this is probably an issue with Rogue/Pygments[0][1] since I doubt Github is rolling their own syntax highlighter.

[0]: https://github.com/jneen/rouge

[1]: http://rouge.jneen.net/pastes/6nDQ

>>> "params[:sandboх] = true".decode('ascii')

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

UnicodeDecodeError: 'ascii' codec can't decode byte 0xd1 in position 14: ordinal not in range(128)