Is there way to tell if a given character (i.e. code point) is printable?

Questions / Help
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1

Is there any way to tell if a given character (e.g. ä) or a code point (e.g. 228) represents a printable character (and not, say, a formatting control or something non-printable)?

2

Any of these works:

String.printable?(<<228>>)
String.printable?(<<0x00E4 :: utf8>>)
String.printable?("ä")
String.printable?("\u00ff")
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