@dibblego - would your Scala method impl of `def isInt(x: String): Boolean` include `isInstanceOf[Int]` or regex to not break parametricity?
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This http://stackoverflow.com/questions/37997809/scala-filter-only-digits … made me think of your parametricity talk. So that's why I had asked the question
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The user wants to fix the type, not the function, which is difficult to determine. List[Either[(String, Int), (Int, String)]]
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