Improve first Example of "The satisfies Operator" in TS 4.9 r notes - #3050
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Marius (mariusgau)
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See for details: microsoft/TypeScript#57005
tl;dr: Documentation is incorrect or misleading. Since values are unions of string and array, palette.red.at(0) will not throw an error, because
at()method is a method that exists for both types.