PSUseOutputTypeCorrectly: Fails when using multiple output types

Steps to reproduce

The following code snippet returns to objects with different types.

function Get-Function
{
    [CmdletBinding()]
    [OutputType(
        [System.String],
        [System.UInt32])]
    param ()

    return [System.String] 'hello', [System.UInt32] 1
}

$myString, $myInt = Get-Function
$myString.GetType()
$myInt.GetType()

But when running the analyzer on this it hits rule PSUseOutputTypeCorrectly .

Invoke-ScriptAnalyzer -ScriptDefinition @'
function Get-Function
{
    [CmdletBinding()]
    [OutputType(
        [System.String],
        [System.UInt32])]
    param ()

    return [System.String] 'hello', [System.UInt32] 1
}
'@

Expected behavior

No rule should be hit since the OutputType contains two output types which is valid syntax according to this https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_outputtypeattribute?view=powershell-5.1

Two or more output types could equal to System.Object[]. But preferably it should see if there are multiple output types, and then see how many return values there are.

Actual behavior

RuleName                            Severity     ScriptName Line  Message
--------                            --------     ---------- ----  -------
PSUseOutputTypeCorrectly            Information             9     The cmdlet 'Get-Function' returns an object of type '
                                                                  System.Object[]' but this type is not declared in the
                                                                   OutputType attribute.

Environment data

> $PSVersionTable


Name                           Value
----                           -----
PSVersion                      5.1.18890.1000
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.18890.1000
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

> (Get-Module -ListAvailable PSScriptAnalyzer).Version | ForEach-Object { $_.ToString() }

1.18.1

まず Invoke-ScriptAnalyzer を使用して例を再現し、PSUseOutputTypeCorrectly ルールが複数の OutputType 値と返される値をどのように処理するかを追跡します。完了の条件は、有効な関数が診断を生成しなくなり、このルールのテストが存在するすべての場所に回帰テストのカバレッジが追加されていることです。