I agree with Ben on the best practices thing. Also, as somebody who wrote C, C++, and C# at the same time (and sometimes compiled into the same binary), I can say programming like that really forces you to understand how the languages work and how it all ties into how computers work. It may not be useful for most high level programmers, but it's good insight nonetheless.
It is good insight. I guess it also depends on how far apart the languages are syntactically and otherwise.
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