PKSUID - KSUID with arbitrary string prefix

PKSUID is a small extension of the KSUID (K-Sortable Globally Unique IDs) https://github.com/segmentio/ksuid which allows prefixing KSUID with the 16 bytes arbitrary string to achieve the following kind of the identifiers:

user:208AocW9380pRVFbQ6sj6Oofu0w
product:208BJB4ntOzehBIADBW6h69juir
anything208BLsTohQ0OnynbQxoeyoRu086

Stripe uses this kind of identifier.

Why using the prefix?

The prefix part might carry additional information valuable for an application. For example the one can indicate the polymorphic relationship of a resource using an identifier with a prefix.

If you don't need prefixes, we strongly recommend using KSUID

Example

	userPrefix := pksuid.Prefix{'u', 's', 'e', 'r', ':'}
	id := pksuid.New(userPrefix)

	fmt.Println(id)
	// prints something like this: user:208ETB1zVhm50luzEgNAnLRNQZE

	id2, _ := pksuid.Parse("user:208ETB1zVhm50luzEgNAnLRNQZE")
	fmt.Println(id2.Prefix())
	fmt.Println(id2.Prefix() == userPrefix)
	fmt.Println(id2.ID())
	// user:208Np9GX0sC0J42peUKj4nW1CW9
	// user:
	// true
	// 208ETB1zVhm50luzEgNAnLRNQZE