> $foo = @()
> $foo.GetType()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     True     Object[]                                 System.Array

> $foo = Invoke-Command -ScriptBlock { @() }
> $foo.GetType()
You cannot call a method on a null-valued expression.
At line:1 char:1
+ $foo.GetType()
+ ~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

> $foo -eq $null
True