Not sure this warrants a bang method, since it doesn't write any changes, modify the object in place, or have any unusual side effects, and there's no non-bang version to compare its 'danger level' with.

Banging methods (hee) is a bit of an inexact science, but here's a good explanation:
http://dablog.rubypal.com/2007/8/15/bang-methods-or-danger-will-rubyist