todo example with PULIDs (Prefixed ULIDs).

PULIDs are an identifier encoding scheme that builds upon the excellent [ULID](Universally Unique Lexicographically Sortable Identifier) scheme. Prefixes should maintain compatibility with base32. If constrained to 2 characters for encoding the entity type, the number of types of entities that can be referenced with this scheme is 2^32 (1024).