That is correct. All the improvements were built in to the next version.
And, you cannot hack the 1.3.9 capabilities out of it and into 1.3.8 because there are numerous codependencies on other parts of the code that are shared with many other infrastructure pieces. To get the benefits, including security improvements and bugfixes, of v1.3.9, you need to upgrade to 1.3.9.
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