[enilsen16]

Stacked on #7.

Summary

Definition.Aliases lists earlier object types. Parsing still accepts them through Parse, FromStorage, Scan and JSON in the full format, and through ParseUnion. Every encoder emits ObjectType. A prefix can then be renamed, the way Stripe moved card_ and src_ to pm_, without breaking values that are already stored or sent.

• The spec keeps one prefixes list, with the object type's prefix first. Parsing, WrongPrefixError.Want and union matching all read that list, and in a union the longest prefix still wins.
• Alias names go through ObjectType.validate. One set of seen names rejects both a repeat of the object type and a duplicate alias.
• CheckUnion rejects an alias that is another member's prefix.

Tests

alias_test.go covers parsing each alias, Scan in full storage, an unknown prefix, union matching, and the definition errors. Parse stays at 22 ns with 0 allocs. CI runs only on PRs to main. Locally, go test -race, go vet and golangci-lint pass.

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