[HumanDrivenDev]

A bit of an aside: why is it not standard practice to format uuids in a radix 64 encoding? It cuts down the identifier size from 32 to 22 characters

[jaza]

I'm a fan of formatting UUIDs in Base62 (which is like Base64 but doesn't require any non standard alpha-numeric characters). I have used Base62-encoded UUIDs in URLs and APIs on several occasions. It's not standard, but if you google around you'll see that it's gaining popularity, because of the shorter identifier length.