Get-VariableType : Workaround to get the type of PSVariable when it s $null

Get-VariableType

function Get-VariableType {
#If a PSVariable is $null, it is impossible to get his type.
#One must read the _convertTypes member of ArgumentTypeConverterAttribute class.
#Origin : http://poshcode.com/998
    param([string]$Name)
    Write-Debug ("Call : {0}" -F $MyInvocation.InvocationName) 
    get-variable $name | select -expand attributes | ? {
        $_.gettype().name -eq "ArgumentTypeConverterAttribute" } | % {
        $_.gettype().invokemember("_convertTypes", "NonPublic,Instance,GetField", $null, $_, @())
    }
   Write-Debug ("End : {0}" -F $MyInvocation.InvocationName)
}