PowerShell max depth for serialising data objects into child scopes. Execute this and observe how data is progressively lost while PowerShell serialises the object into the scopes.

xmlserialisation.ps1

$xml = [xml]"<parent><child name='Adam'><grandchild name='Charlie'></grandchild></child></parent>"
$xml.parent
$xml.parent.child
$xml.parent.child.grandchild

Invoke-Command -ComputerName 'hostname' -ArgumentList $xml.parent -ScriptBlock {
  param($xml)
  $xml.child
  $xml.grandchild
}

Invoke-Command -ComputerName 'hostname' -ArgumentList $xml.parent, (Get-Credential) -ScriptBlock {
  param($xml, $cred)
  Invoke-Command -VMName 'vmname' -Credential $cred -ArgumentList $xml -ScriptBlock {
    param($xml)
    $xml.child
    $xml.grandparent
  }
}