The family is the published stable head, then outstanding -rc claims, then
the seed 0.21.4 when both are empty, so the first release is 0.21.5. CalVer
tags are excluded rather than sorted: v2026.9.21 is a valid three-component
version and would win every max(). A +canary identity compares equal to its
stable; the legacy -canary prerelease still sorts before its stable so feeds
published before the migration keep their order.
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