UUIDV7 ver and variant fields not filled in standards compliant way

[timstokman]

According to the standard:

• The version field should be filled with 0111 (base 10 => 7)
• The variant field should be filled with 10 (base 10 => 2)

I checked with other UUIDv7 generators (as in https://www.npmjs.com/package/uuidv7/v/0.5.3), and those libraries do fill those fields in a compliant way. Your library doesn't match. Might be a bit of a compatibility issue, makes it harder for libraries to recognize they're dealing with UUIDv7, might be compatibility issues.

.NET 9 also sets these fields correctly: https://github.com/dotnet/runtime/blob/039697860b0985bfaecd4e6d37e2968516daad9d/src/libraries/System.Private.CoreLib/src/System/Guid.cs

See Version7Value.

[mareek]

As far as I know, every UUID generated by UUIDNext have the correct version and variant bit set.

Can you provide some code examples where UUIDNext fails to set those bits ?

[timstokman]

I'm sorry, I think might've hit the sql server path somewhere, which doesn't generate UUIDv7. Sorry for wasting your time.

[mareek]

Ok, no problem.

Uuid.NewDatabaseFriendly(Database.SqlServer) generates UUID V8 which is the version for creating custom UUIDs