Generic collection as parameters - powershell

Question

I would like to use a generic collection as a parameter type for a PowerShell function like so:
function Execute-Tokenlist
{
param([System.Collections.Generic.List[WTToken]]$Tokenlist)
}
[WTToken] is just a custom type.
I create a new generic collection list with WTToken objects:
$TokenList1 = New-Object -TypeName System.Collections.Generic.List[WTToken]
But when I try to call the function
Execute-Tokenlist -Tokenlist $TokenList1
the result is a ParameterBindingArgumentTransformationException because PowerShell turns System.Collections.Generic.List`1[WTToken] into a new type:
System.Collections.Generic.List`1[[WTToken, TokenListeAuswerten.ps1, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]
So it adds the script name as an assembly name to the type name.
My question is: How can I prevent that PowerShell does these kind of type transformation?
I know I could use Object as a parameter type but I don't like giving up type checking for no good reason.

Answer 1

I found the solution and (of course) it has a simple explanation.
Powershell includes in the full name of any type thats based on a class definition the path of the Ps1 file that contains the class definition or just "\powershell" if the definition is not in a ps1 file.
My mistake was that I was opening a new script window inside the ISE and put in the code for defining the class.
Then I tried to put an object based on that class in a generic collection that was already defined inside a ps1 file and has an Add method that excpects objects with a type that includes a ps1 file. Since the new object type name didn't contain that ps1 path I got that error messages that didn't make sense to me (now it does).
Here is the complete PowerShell script code again:
class WTToken
{
[String]$Type
[String]$Name
[Bool]$Value
}
$TokenList = [System.Collections.Generic.List[WTToken]]::new()
$Token = [WTToken]::new()
$TokenList.Add($Token)
$TokenList.GetType().FullName
Start the ISE, paste in that code and save it into a ps1 file, eg. test.ps1 and run it with F5.
Now open a new script window and paste in the following Powershell code:
class WTToken
{
[String]$Type
[String]$Name
[Bool]$Value
}
$Token = [WTToken]::new()
$TokenList.Add($Token)
Run this and an error message should appear.