[enilsen16]

Summary

• ValidateUUID accepts only the canonical form: 36 characters, lowercase and hyphenated. It rejects upper case, URN, brace and unhyphenated forms. One UUID can then never be two different IDs, which is the TypeID spec rule.
• Definition.Normalize and NormalizeUUID are removed. The Elixir package has no matching option: its cast returns parse/1 unchanged, and validate: :uuid keeps the value as given. Validate is again the only hook, the same name as in Elixir.

This is a breaking change before v1. Callers that receive other UUID forms convert them before New, for example with uuid.Parse(s) and then .String(). The matching Elixir change is to make validate: :uuid accept only the canonical form too.

#11 needs to merge first, so this releases as 0.3.0 and not 1.0.0.

Tests

TestValidateUUID covers the canonical form and each rejected form. The existing decoder tests already check that Parse, FromStorage, Scan and JSON return ErrInvalidUUID. The Normalize tests and example are removed.

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[coderabbitai]

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