[rt-users] Suggestion: use checksum digits to avoid similar sounding numbers

[Kelly Jones]

RT currently numbers tickets sequentially. This works well in many
cases, but, over the phone (for example), it's easy to confuse 76676
and 76767, for example.

I suggest numbering tickets in such a way that there's a checksum
digit (a la ISBN codes), perhaps something as simple as incrementing
the count by 11 each time.

A more sophisticated solution: generate the numbers so that 1 error
can be detected *and* corrected.

I'm guessing infinite sequences of numbers meeting the above property
already exist and are well-known?

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