On Python 3, evaluating a Vim expression will raise a unicode exception
if it contains an invalid sequence of bytes for the current encoding.
We can't really do anything about it because this is the way Vim and
Python 3 interact. However, we can prevent this situation to occur by
not evaluating Vim data that we have no control over: in particular,
the Vim globals. This is done by:
- adding one by one the YCM default options instead of extending the
Vim globals with them;
- only evaluating the Vim global variable names (and not their values)
when building the YCM options for the ycmd server.
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