Pwsh 7: Could not resolve `Foreach-Object` 's `-Parallel` argument using ConvertTo-SplatExpression

[SeeminglyScience]

Moved from PowerShell/PowerShellEditorServices#1610 from @ninmonkey (thanks for the report!)

---

Issue:

Splat is outputting this

$forEachObjectSplat = @{
    Parallel = -Parallel
}
Get-Process | ForEach-Object @forEachObjectSplat {

Expected Behaviour

-parallel should splat as a bool

To reproduce

Use ConvertTo-SplatExpression on the For-EachObject

$threadSafeDictionary = [System.Collections.Concurrent.ConcurrentDictionary[string, object]]::new()
Measure-Command -Expression { & {

        Get-Process | ForEach-Object -Parallel -ThrottleLimit 3 -UseNewRunspace {
            $dict = $using:threadSafeDictionary
            $dict.TryAdd($_.ProcessName, $_)
        }
    }
}

$threadSafeDictionary.Values | Format-Table -AutoSize

Behavior

Creating new windows, keeps reproducing the error

Environment

test 1

Addon	Version
ms-vscode.powershell-preview	2021.10.3
TylerLeonhardt.vscode-inline-values-powershell	0.0.5
TylerLeonhardt.vscode-pester-test-adapter	0.0.23

code --version
code version: 1.59.1, 3866c3553be8b268c8a7f8c0482c0c0177aa8bfa, x64

test 2

Addon	Version
justin-grote.powershell-extension-pack	0.0.5
ms-vscode-remote.remote-ssh-edit	0.65.8
ms-vscode.powershell-preview	2021.9.2
nickdemayo.vscode-json-editor	0.3.0
PowerQuery.vscode-powerquery	0.1.23
rust-lang.rust	0.7.8
TylerLeonhardt.vscode-inline-values-powershell	0.0.5

PSVersion GitCommitId OS                           PSEdition
--------- ----------- --                           ---------
7.1.4     7.1.4       Microsoft Windows 10.0.19043 Core

code-insiders --version
1.62.0-insider, 284e0db6c4cac1e557a43cd6691babdaafc2e1a9, x64