The +dev builds have many features that won't be in 6.02, but will be in a later release. This is true in general.
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Originally Posted by landoleet.org
+dev: development version. Includes functionality that will likely not end up in
the next release (and may not end up in any release, ever). The version number of these
builds includes the last release/pre-release that build was based on, and the four digit
number following +dev references the month and day the build was made.
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