Core:
Fixed bug #78656 (Parse errors classified as highest log-level).
Fixed bug #78752 (Segfault if GC triggered while generator stack frame is being destroyed).
Fixed bug #78689 (Closure::fromCallable() doesn't handle [Closure, '__invoke']).
COM:
Fixed bug #78694 (Appending to a variant array causes segfault).
Date:
Fixed bug #70153 (\DateInterval incorrectly unserialized).
Fixed bug #78751 (Serialising DatePeriod converts DateTimeImmutable).
Iconv:
Fixed bug #78642 (Wrong libiconv version displayed). (gedas at martynas, cmb).
OpCache:
Fixed bug #78654 (Incorrectly computed opcache checksum on files with non-ascii characters).
Fixed bug #78747 (OpCache corrupts custom extension result).
OpenSSL:
Fixed bug #78775 (TLS issues from HTTP request affecting other encrypted connections).
Reflection:
Fixed bug #78697 (ReflectionClass::ImplementsInterface - inaccurate error message with traits).
Sockets:
Fixed bug #78665 (Multicasting may leak memory).