PowerShell parameter attribute: alias

Question mark as parameter name

The Parameter attribute alias comes in handy to define a question mark parameters:

param (
   [alias('?')] [switch] $help
)

if ($help) {
  'help message'
   return
}

'doing stuff'

PS:> .\qm
doing stuff

PS:> .\qm -?
help message

Unfortunately, this technique does not seem to work when trying to alias an exclamation mark to a parameter.