Pathlib's symlink_to() and link_to() methods have different argument orders, so:
a.symlink_to(b) # Creates a symlink from A to B
a.link_to(b) # Creates a hard link from B to A
I don't think link_to() was intended to be implemented this way, as the docs say "Create a hard link pointing to a path named target.". It's also inconsistent with everything else in pathlib, most obviously symlink_to().
This /really/ irks me. Apparently it's too late to fix link_to(), so I'd like to suggest we add a new hardlink_to() method that matches the symlink_to() argument order. link_to() then becomes deprecated/undocumented.