From type/X/Proc/Async/CharsOrBytes

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method handle(X::Proc::Async::CharsOrBytes:D: --> Str:D)

Returns the name of the handle that was accessed both for text and for binary data, stdout or stderr.

From type/X/Proc/Async/TapBeforeSpawn

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method handle(X::Proc::Async::TapBeforeSpawn:D: --> Str:D)

Returns the name of the handle (stdout or stderr) that was accessed after the program started.