Core:
    Fixed bug #80523 (bogus parse error on >4GB source code).
    Fixed bug #80384 (filter buffers entire read until file closed).
Curl:
    Fixed bug #80595 (Resetting POSTFIELDS to empty array breaks request).
Date:
    Fixed bug #80376 (last day of the month causes runway cpu usage.
MySQLi:
    Fixed bug #67983 (mysqlnd with MYSQLI_OPT_INT_AND_FLOAT_NATIVE fails to interpret bit columns).
    Fixed bug #64638 (Fetching resultsets from stored procedure with cursor fails).
    Fixed bug #72862 (segfault using prepared statements on stored procedures that use a cursor).
    Fixed bug #77935 (Crash in mysqlnd_fetch_stmt_row_cursor when calling an SP with a cursor).
Phar:
    Fixed bug #77565 (Incorrect locator detection in ZIP-based phars).
    Fixed bug #69279 (Compressed ZIP Phar extractTo() creates garbage files).
SOAP:
    Fixed bug #80672 (Null Dereference in SoapClient). (CVE-2021-21702)