According to
https://www.tug.org/pipermail/latex3-commits/2016-August/001050.html
\cs_new:Nn now checks that the function it defines has only 'n' or 'N' in the signature.
This breaks pkgloader.sty when trying to define __pkgloader_strip_extension:f
This is fixed by using \cs_new:Npn instead.
According to https://www.tug.org/pipermail/latex3-commits/2016-August/001050.html \cs_new:Nn now checks that the function it defines has only 'n' or 'N' in the signature. This breaks pkgloader.sty when trying to define __pkgloader_strip_extension:f This is fixed by using \cs_new:Npn instead.