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An alternative solution: ```STYL default(var, def) if var != null return var else return def ```

My version is [v3.7.0](https://pkgs.alpinelinux.org/package/edge/community/x86_64/sassc) run on Alpine image for Docker also encounters this bug.  The screenshot is just for demonstrate...

> > > For me this is a problem when I minify multiple files or some files that are > 1MB. > > If I minify files one by one...