Note that the 1.6 beta gets built off the release-1.6 branch, not the latest master branch. Once 1.6 was branched off, only bug fixes are backported to release-1.6, so if you observe any differences between the two, that’s most likely due to this, not the way it was built. You can download nightlies from the website as well, which always get built off the current master branch.
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