this is desired behaviour. % is an escape character.

closing issue.

Should work similar to oper, uoper and boper and allow usage of user-defined
charcters.
Setting target to OOo later though.

.

Please, don't send private emails, always add your comments to the issue.

Recieved via pm:
I beleive I was not clear enough. Just as example
  %GAMMA
produces big Greek letter gamma, which is OK.
This letter is considered variable, so it is italic.

Now, I would like to express gamma function. Expression
  func( %GAMMA )
should give me big gamma not italic,
but produces string "%GAMMA" instead of greek letter