1.51.3 (May 8th, 2026)

Fixed

• sync: fix underflow in mpsc channel len() (#8062)
• sync: notify receivers in mpsc OwnedPermit::release() method (#8075)
• sync: require that an RwLock has max_readers != 0 (#8076)
• sync: return Empty from try_recv() when mpsc is closed with outstanding permits (#8074)