alt Hacker NewsOne impact of the_mitsuhiko's second point is during debugging.
Usually if you see an id in your http logs you can simply search your database for that id. The v4 to v7 indirection creates a small inconvenience.
The mismatch may be resolved if this was available as a fully transparent database optimization.
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nightpool • yesterday at 8:27 PM
Not just a small inconvenience—because there's no human readable way to tell the difference between v4 and v7 IDs, you have to guess and check whether or not the ID your server process is logging is a pre-conversion or post-conversion ID
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A Postgres extension is currently in development to provide transparent database optimization with custom type uuid45 and optional helpers ;)