2.4.2

Performance

• String values are decoded straight into the zend_string handed back to PHP, so a read no longer copies the value twice
• Copying a value and checksumming it are now a single pass on writes as well as reads
• The next probe slot is prefetched while the current one's lock, load and compare are still in flight
• Faster argument parsing for add/set/get/delete/dump
• dump() builds its result array in bulk instead of one insert per entry
• Overwriting an entry whose value has outgrown its block skips the checksum of the block being replaced
• CRC-32C now picks its implementation by probing the CPU at runtime, so a binary built with -msse4.2 still runs on older hardware

Fixes

• Fixed get() crashing under concurrency: find() bumped the entry's hit count and access time without holding the slot, which could overwrite the type flag a concurrent write had just published and send the reader into a wild pointer
• flush() now takes every slot before clearing the table; it could previously land in the middle of another writer's publish and leave a slot permanently unusable — every later read missing on it and every later write rejected
• dump() returns an empty result while a flush() is in progress instead of reporting half-cleared slots
• Fixed a wild-pointer read in the block-value guard of find()
• Fixed dump() on PHP older than 7.4
• Fixed the packaged tarball missing storage/crc, which made it fail to build (regression in 2.4.1)