Std.Uuid.version4

fn

This is a callable function.

What it does

A random identifier.

The generator is passed and answered rather than kept, so a program that

seeded it reproduces the same identifiers. That is what makes a test that

failed on one identifier able to fail on it again.

Std.Random is reproducible on purpose and seeded from a readable clock,

which makes these fit for a key in a database and unfit for anything a

person must not be able to guess. A session token wants a random source

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