one of my repos is currently being identified as a nix project, because it contains a few very large generated nix files. it has a .gitattributes file to mark those files as generated file so they don't factor into language calculations, but tangled currently doesn't seem to read it.
this looks to be quite a longstanding issue in the library being used to perform these calculations, so i'm not sure if this is a problem that tangled itself can solve just yet. just reporting this issue as a feature that would be nice to have, in case it's useful for tracking purposes.