{{A filesystem path that you're allowed to write to.
The set of permitted values is generated from a set of roots by closing it
under the subdirectory relation.}}
+extern val end_in_slash : your_path -> your_path;
+{{Add a slash at the end of a path, if there isn't one already.}}
extern type readable_path;
{{Like [your_path], but also includes some paths that everyone is allowed to