Do not save consecutive duplicate commands to history#1120
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Emulates
HISTCONTROL=ignoredupsfrom Bash and partly addresses #355.IRB will not add a command to history if it's the same as the immediate previous command; it won't look further back in the history list. This is also the default behavior in Pry.
It might be safer to expose this as a config flag but personally I don't see the value in consecutive duplicate entries. Open to discussion, of course!