platform-dependent testing.CaptureMode type alias#3452
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CliRunner.__init__will raise aValueErrorifcapture="fd"on windows. By using the fact that type-checkers are able to understand basicsys.platformchecks (https://typing.python.org/en/latest/spec/directives.html#version-and-platform-checking), we can use Python's type system to prevent this from happening, by having a definition for theCaptureModetype alias on windows, improving type-safety.