^{Note: Also affects other common parameters: see #3773}

Steps to reproduce

$null = Get-Date -OutVariable ov; $ov.GetType().FullName

Expected behavior

Type name System.DateTime

Actual behavior

Type name System.Collections.ArrayList

That is, the single-object output stored in the variable targeted with -OutVariable received an array list rather than a scalar (the single-element collection wasn't unwrapped).

Also, it is type [System.Collections.ArrayList] that is always used, in contrast with the [System.Object[]] instances you get with regular assignments.

Environment data

PowerShell v6.0.0-alpha (v6.0.0-alpha.15) on Darwin Kernel Version 16.4.0: Thu Dec 22 22:53:21 PST 2016; root:xnu-3789.41.3~3/RELEASE_X86_64
PowerShell v5.1.14393.693 on Microsoft Windows 10 Pro (64-bit; v10.0.14393)