concurrent-ruby: Concurrent Ruby : `AtomicReference#update` livelocks when the stored value is `Float::NAN`
Concurrent Ruby : `AtomicReference#update` livelocks when the stored value is `Float::NAN` (high). GHSA-h8w8-99g7-qmvj, CVE-2026-54904.
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Concurrent Ruby : `AtomicReference#update` livelocks when the stored value is `Float::NAN`
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