Lately, I have been entering a number of coupon codes on the web, and have found them to be infuriatingly lacking in one respect: the character set used for the codes is not easy to type.

I'm sure we have all questioned at one point if a character in the code was supposed to be a 0 (zero) or O (upper-case letter O), or a 1 (one), I (upper-case letter I), or l (lower-case letter L). Usually you just pick one, and usually you get it wrong the first time.

I find it particularly strange, that Starbucks would go so far as to recognize this problem, but not actually fix it:

As a developer, there are a few increasingly dramatic ways to deal with this.

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