duktape: Unicode string problem

In one of my unit tests I create a folder “Κάποιος κατάλογος” in a workdir. Then cd into that and read the current work dir. This suprisingly gives me:

x chdir (0 of 1 succeeded) Failure: Expected ‘output/process-specs/currentPath/Κάποιος κατάλογος’ to be ‘output/process-specs/currentPath/Κάποιος κατάλογος’.

When I print both strings char by char I can see why comparison fails. The string managed in JS is stored in non-combined form (NFD?) while the file system returns a composed string (probably NFC). This is relevant for the 2 ά letters. Removing them makes the test succeed.

Obviously I have to normalize the strings, however duktape doesn’t seem to support that. When I call normalize() I get an error. What alternatives do I have?