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I've been watching these 5 RCs for a while now because of great additions:

- Build time variables: https://docs.docker.com/engine/reference/builder/#arg

- docker volume subcommand, finally we have a sane way to clean up left over volumes which are left by default.

That volume subcommand is critical to any description of Docker as "production ready". Docker defaults to leaving volumes "dangling" on the filesystem and there was previously no supported way to remove them. Really glad to see this make it in.

Volumes have been an underdeveloped part of the Docker world for a long time. It took a long time, but it looks very promising.

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