PowerShell - 当覆盖与该函数同名的cmdlet名称时，如何在函数中调用cmdlet？

function update-name {
param([string] something)
  #call cmdlet update-name here
}

$unBackup = 'DefaultUpdateName'
if(!(Test-Path Function:$unBackup)) {
    Rename-Item Function:Update-Name $unBackup
}

function update-name {
  & $unName
}

PS> Get-Command Start-Process | Format-Table ModuleName

ModuleName
----------
Microsoft.PowerShell.Management

PS> Microsoft.PowerShell.ManagementStart-Process Notepad

$unName=Get-Command 'Update-Name' -CommandType Cmdlet;

function update-name {
  & $unName
}