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in a similar fashion to TypeScript, Whiley and FLOW, which in fact, took the idea from Ceylon.

Union types, written A|B, allow a variable to have more than one type. The following example shows a Ceylon function which may take either an integer or a string:

shared void integerOrString(Integer|String input) { if (is Integer input) { print("Got the integer ``input``"); } else { print("Got the string '``input``'"); }}

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