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MIT License
Copyright (c) 2026 Branden J Brown
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# [proposal: crypto/rand: add UUIDv4 and UUIDv7](https://golang.org/issue/76319)
This package is an implementation of the crypto/rand API amended as proposed by #76319.
```go
// UUIDv4 generates a RFC 9562 Version 4 UUID
// using only random bytes in the format:
// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
func UUIDv4() string
// UUIDv7 generates a RFC 9562 Version 7 UUID
// using the current time and random bytes in the format:
// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
func UUIDv7() string
```
The UUID functions forward to github.com/google/uuid.
The rest forward to crypto/rand.
Unless you are changing the value of rand.Reader, this package a drop-in replacement for crypto/rand.
This is an ergonomics test.
Most other UUID packages define `[16]byte` types, but #76319 proposes to add functions that return only the string forms of UUIDs.
You can use this package to check whether the proposed API works (better?) for you.
There are questions that have been raised about the proposed API, especially with regard to the clock component of v7 UUIDs.
This package does not address those.