Core:
    Fixed bug #81145 (copy() and stream_copy_to_stream() fail for +4GB files).
    Fixed bug #81163 (incorrect handling of indirect vars in __sleep).
    Fixed bug #80728 (PHP built-in web server resets timeout when it can kill the process).
    Fixed bug #73630 (Built-in Weberver - overwrite $_SERVER['request_uri']).
    Fixed bug #80173 (Using return value of zend_assign_to_variable() is not safe).
    Fixed bug #73226 (--r[fcez] always return zero exit code).
Intl:
    Fixed bug #72809 (Locale::lookup() wrong result with canonicalize option).
    Fixed bug #68471 (IntlDateFormatter fails for "GMT+00:00" timezone).
    Fixed bug #74264 (grapheme_strrpos() broken for negative offsets).
OpenSSL:
    Fixed bug #52093 (openssl_csr_sign truncates $serial).
PCRE:
    Fixed bug #81101 (PCRE2 10.37 shows unexpected result).
    Fixed bug #81243 (Too much memory is allocated for preg_replace()).
Standard:
    Fixed bug #81223 (flock() only locks first byte of file).