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kotlinlang

so Char++, Char.minus, Char.plus creates possibly invalid Char in that they are not represented in a block by a character.  And sometimes at boundaries of numeric overflow, they do a different behavior than "go to next" or "go to previous" char.  I don't think we should pretend Char are numbers.  Let people write their own `.plus()` and `.minus()` extensions when they want to pretend for cases like ASCII or `myChar - 'A'` coding.  That is consistent with other number handling in Kotlin which would say "convert to Int to do Int math" not "pretend a Char is an Int for a moment"