The 3.22 version has a faster and safer connect code and a lot of new nice enhancements. This reason for not including these changes in the 3.21 version is mainly because we are trying to avoid big changes to 3.21 to keep is as stable as possible. As there isn't really any MAJOR changes, upgrading to 3.22 should be very easy and painless.
3.22 includes also the new DBD-mysql (1.1830) driver that can use the new connect protocol!
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