[Internal review] Proposal draft: anchored composability invariant (do not merge, do not notify upstream)#24

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invoca/proposal-anchored-composability-invariant

Commits on Apr 19, 2026

Draft proposal: document and test anchored linearity invariant
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Clarify: range membership vs. anchor lookup are distinct
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Use r (range) notation to match Prometheus terminology
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Use PromQL-native notation: @ T instants + range durations
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Restore numeric subscripts; drop underscore placeholder names
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Define T₁ and T₂ independently; derive r₂ from the interval
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State the invariant in terms of three primary timestamps
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Explain that @ is always the right edge of an anchored range
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