Core:
    Fixed #80706 (mail(): Headers after Bcc headers may be ignored).
DOM:
    Fixed bug #80600 (DOMChildNode::remove() doesn't work on CharacterData nodes).
Gettext:
    Fixed bug #53251 (bindtextdomain with null dir doesn't return old value).
MySQLnd:
    Fixed bug #78680 (mysqlnd's mysql_clear_password does not transmit null-terminated password).
    Fixed bug #80713 (SegFault when disabling ATTR_EMULATE_PREPARES and MySQL 8.0).
MySQLi:
    Fixed bug #74779 (x() and y() truncating floats to integers).
Opcache:
    Fixed bug #80634 (write_property handler of internal classes is skipped on preloaded JITted code).
    Fixed bug #80682 (opcache doesn't honour pcre.jit option).
    Fixed bug #80742 (Opcache JIT makes some boolean logic unexpectedly be true).
    Fixed bug #80745 (JIT produces Assert failure and UNKNOWN:0 var_dumps in code involving bitshifts).
OpenSSL:
    Fixed bug #80747 (Providing RSA key size < 512 generates key that crash PHP).
Phar:
    Fixed bug #75850 (Unclear error message wrt. __halt_compiler() w/o semicolon) (cmb)
    Fixed bug #70091 (Phar does not mark UTF-8 filenames in ZIP archives).
    Fixed bug #53467 (Phar cannot compress large archives).
Socket:
    Fixed bug #80723 (Different sockets compare as equal (regression in 8.0)).
SPL:
    Fixed bug#80719 (Iterating after failed ArrayObject::setIteratorClass() causes Segmentation fault).
Standard:
    Fixed bug #80654 (file_get_contents() maxlen fails above (2**31)-1 bytes).
    Fixed bug #80718 (ext/standard/dl.c fallback code path with syntax error).