PR #140: Let a constructor say what a list is for

Agent Instructions

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https://staging.nix-ci.com/gh:NorfairKing:sydtest/refs%2Fpull%2F140%2Fmerge/444e9c41ffed6dbafefd19c3efc45d298d0e2045

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• curl --netrc -H 'Accept: application/json' https://staging.nix-ci.com/gh:NorfairKing:sydtest/refs%2Fpull%2F140%2Fmerge
• curl --netrc -H 'Accept: text/markdown' https://staging.nix-ci.com/gh:NorfairKing:sydtest/refs%2Fpull%2F140%2Fmerge

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