created_tmp_disk_tables variable to mysqld.
TIMESTAMP(X) columns, MySQL now reports columns with X
other than 14 or 8 to be strings.
latin1 as it was before MySQL Version 3.23.23.
Any table that was created or modified with 3.23.22 must be repaired if it has
CHAR columns that may contain characters with ASCII values greater than
128!
BDB tables and reading on a unique (not primary) key.
win1251 character set (it's now only marked deprecated).