Upstream has split a package in two -> new Debian package?

[Christoph Mathys <eraserix@gmail.com>]

Hi!

I'm the package maintainer of mercurial-keyring, a keyring extension for 
mercurial. Upstream has split some of the functionality of 
mercurial-keyring into a separate python library and pip package 
(mercurial_extension_utils). Do I need to create and upload a new 
package for this library? Or is there another way?

I doubt that this library will get a second user, but you never know...

For reference:
https://pypi.python.org/pypi/mercurial_extension_utils
https://pypi.python.org/pypi/mercurial_keyring

Thanks.
Christoph