alphagov/backdrop — pull request #264 by alexmuller (2014-04-10 16:26:45+00:00)
Title: Remove ambiguous characters from tokens

These are handled by humans, and occasionally humans use typefaces that do not distinguish between certain characters very well.

This is the reason that I and Q are excluded from UK vehicle registration plates.

Remove the characters zero, one, oh, eye and ell from tokens. Make them all lowercase, because there's no good reason not to.