[src/Numbertext.hxx:15]: (performance) Function parameter 'st' should be passed by const reference.
[src/Numbertext.cxx:75]: (performance) Function parameter 'lang' should be passed by const reference.
[src/Numbertext.cxx:83]: (performance) Function parameter 'lang' should be passed by const reference.
[src/Numbertext.hxx:15]: (performance) Function parameter 'st' should be passed by const reference. [src/Numbertext.cxx:75]: (performance) Function parameter 'lang' should be passed by const reference. [src/Numbertext.cxx:83]: (performance) Function parameter 'lang' should be passed by const reference.