Why does Get-Date seem to return DateTime objects, but the BinarySerializer indicate it returns a PSObject?

Question

Take the simple HashTable:

$data = @{
    First = \'Justin\';
    Last = \'Dearing\';
    StartDate = Get-Date \'2002-03-23\';
}

The key St

Answer 1

Base on the msdn:

PSOobject Class : Encapsulates a base object of type Object or type PSCustomObject to allow for a consistent view of any object within the Windows PowerShell environment.

 ( get-Date '2002-03-23' ) -IS [psobject]
True

( get-Date '2002-03-23' ) -IS [datetime]
True

[datetime]( get-Date '2002-03-23' ) -IS [datetime]
True

[datetime]( get-Date '2002-03-23' ) -IS [psobject]
False