[enilsen16]

Stacked on #3.

Summary

• ObjectType, Separator and Prefix are named string types, so an object type, a separator and a prefix cannot be swapped by mistake. Untyped string constants such as ObjectType: "user" still compile.
• ValidationError.ObjectTypes lists the object types a value was checked against: one for an ID, every member's for a union.
• Bare() and the parse inputs stay string, because they are the wire and storage boundary.
• The object type must be lowercase snake_case of at most 63 characters, the TypeID prefix rule. ObjectType.validate checks this with a byte loop, and every constructor fails with ErrInvalidDefinition when the rule is broken. The Elixir package does not check this yet.
• Check[T]() and CheckUnion[U]() report a bad definition in a test or init, including a generator whose values the type's own validation rejects. They are the Go form of the Elixir compile-time checks.
• A value without one of the accepted prefixes fails with *WrongPrefixError{Want []Prefix}, for single types and unions. It unwraps to ErrInvalidFormat, so errors.Is checks keep working.

This is a breaking change before v1: ValidationError.ObjectType is replaced by ObjectTypes, and the accessors return the named types.

Tests

• An internal table test covers the object type rule.
• check_test.go covers Check, CheckUnion, and the prefix error for a wrong prefix, a missing prefix and a union.

CI runs only on PRs to main. Locally, go test -race, go vet and golangci-lint pass.

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