PSUseOutputTypeCorrectly is triggered when it shouldn't.

It looks to me like PSUseOutputTypeCorrectly check is not taking very basic, crucial, fundamental fact about PowerShell into account: by default it will not keep any simple collection, unless you explicitly tell it to.

Result? I have PInvoke code (taken from here) and I correctly defined OutputType as [Connection] (I've actually created namespace for it, but that's irrelevant).
As expected, Get-Member confirms that PowerShell function will return stream of connections, not collection as a whole. Yet, PSScriptAnalyzer will complain about it:

Line: 45 - The cmdlet 'Get-OPNetStat' returns an object of type 'Optiver.Connection[]' but this type is not declared in the OutputType attribute. 
Line: 54 - The cmdlet 'Get-OPNetStat' returns an object of type 'Optiver.Connection[]' but this type is not declared in the OutputType attribute. 

In fact, if I would follow instructions and declare my OutputType as a collection it would be conflicting with what my function actually returns:

Set-StrictMode -Version Latest
Get-OPNetStat | % IsFixedSize
% : The input name "IsFixedSize" cannot be resolved to a member.

IsFixedSize was tab-completed, based on OutputType that PSScriptAnalyzer told me to define. As expected, my Connection object doesn't have it. The only workaround I've found that satisfies both PSScriptAnalyzer and my hope to get nice tab-completion for command I wrote is to pass result of the command thru ForEach-Object:

[Optiver.NetworkUtil]::GetTCP() } | ForEach-Object { $_ }

Beginne mit der Regel PSUseOutputTypeCorrectly und reproduziere das gemeldete Get-OPNetStat-Beispiel, einschließlich der Ausgabe von [Optiver.NetworkUtil]::GetTCP() und des Verhaltens von Get-Member. Vergleiche den deklarierten Ausgabetyp [Connection] mit der Diagnose Connection[] des Analysators; abgeschlossen ist die Aufgabe, wenn eine gültige Stream-Ausgabe diese falsche Warnung nicht mehr erzeugt, während die Tab-Vervollständigung des Ausgabetyps weiterhin korrekt bleibt.