in reply to Should perl implement ,= or maybe overload .= (array context)
To me, making .= do array concat seems rather off, for similar reasons to + not doing string concat. It's just not the right operator for the job. ,= is rather more interesting, but I don't really see a reason to introduce it; push @foo, @bar works just like you'd propose @foo ,= @bar to do.
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In Section Meditations