Case sensitive label mismatch

Thanks for developing this tool.
I have noticed that in some situations, it is possible to have different cases between the label in the bibtex file and the tex.
Example Smith2006 in the bibtex and \cite{smith2006} in the tex.
Here --unused does not work properly.
Would it be possible to add a --case-insensitive command or similar to perform a case-insensitive comparison?

Thanks in advance