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NaN payloads are not preserved: every NaN is one canonical value in the delta and crosses as ADR 005's `nan` token, so ADR 009 no longer changes ADR 005 clause 11. Zeros follow IEEE: -0.0 equals +0.0, and a zero sum takes the sign IEEE gives the same addends. The round-trip property test asserts a NaN comes back as the canonical NaN. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze