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Pull Request
Problem
The timeframe for supporting old versions for six months is a bit unusual and needs extra info on how it is implemented (i.e. table of expiry dates). It is custom and does not fit into standard Tidelift support patterns.
Solution
Supporting security updates for current version and previous major version is simple to explain and understand. It is a standard pattern on Tidelift.
As long as we release the next major version longer than six months from now, the change is an extension to the support period, so ok to do now without waiting for a major release to change policy.
ChangeLog
Extend security support to full lifetime of previous major version.