How to verify UUID format for record keys?

[electrovir]

I'm trying to get the following code to log false, but it's currently logging true:

import {FormatRegistry, Type} from '@sinclair/typebox';
import {TypeCompiler} from '@sinclair/typebox/compiler';

const Uuid = /^(?:urn:uuid:)?[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}$/i;
function IsUuid(value: string): boolean {
    return Uuid.test(value);
}
FormatRegistry.Set('uuid', (value) => IsUuid(value));

console.log(
    TypeCompiler.Compile(Type.Record(Type.String({format: 'uuid'}), Type.Number())).Check({
        x: 5,
    }),
);

The UUID format is straight from https://github.com/sinclairzx81/typebox/blob/60fdafe857089ac908b5fe7741c15c62260b651f/example/formats/uuid.ts.

I would expect x to not match because it's clearly not a valid UUID.