## Problem

Explain the problem you are fixing (add the link to the related issue(s), if any).

## Solution

Explain the solution that has been implemented, and what has been changed.

## Commandments

- [ ] Write PEP8 compliant code.
- [ ] Cover it with tests.
- [ ] Update `CHANGES.rst` file to describe the changes, and quote according issue with `GH-<issue_number>`.
- [ ] Pay attention to backward compatibility, or if it breaks it, explain why.
- [ ] Update documentation (if relevant).