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People use Out-Null despite much faster alternatives:
$null = Do-Stuff
[void] = Do-Stuff
Do-Stuff > $null
This change makes Out-Null work in roughly the same say as the above.
The optimization is to detect that we're calling the built-in Out-Null
cmdlet when invoking a pipeline from script (the change won't have any
effect in the PowerShell api). If we detect Out-Null, we rewrite the
pipe to look similar to `Do-Stuff > $null`.
Testing
The tests are organized by testing language. Thus Pester tests, which are written in the PowerShell language, are in ./powershell and xUnit tests, written in C#, are in ./csharp. The sanity tests for the Full .NET build of PowerShell are in ./fullclr, and the third-party shebang test is in ./shebang.