Trouble with array in PoshRSJob

PoshRS.ps1

# set up a simple array
$Items = @(
    [PSCustomObject]@{Name = 'Item1'; SomeProperty = "1"},
    [PSCustomObject]@{Name = 'Item2'; SomeProperty = "2"},
    [PSCustomObject]@{Name = 'Item3'; SomeProperty = "3"}
)


### enumerate a property of the objects passed in via -ArgumentList
# the output here is always '2'
$SB = {
    param ($Items)

    $Items.SomeProperty
}

$RSJob = Start-RSJob -ScriptBlock $SB -ArgumentList $Items
$RSJob | Wait-rsJob | Receive-RSJob


### try the using variable instead
# I get an error here:
# Start-RSJob : The value of the using variable '$Using:Items.SomeProperty' cannot be retrieved because it has not been set in the local session.
$SB = {
    param ($Items)

    $Using:Items.SomeProperty
}

$RSJob = Start-RSJob -ScriptBlock $SB 
$RSJob | Wait-rsJob | Receive-RSJob

<#
PS c:\> $PSVersionTable

Name                           Value                                                                                                                                                                                                     
----                           -----                                                                                                                                                                                                     
PSVersion                      5.0.10586.117                                                                                                                                                                                             
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                                                                                                                                   
BuildVersion                   10.0.10586.117                                                                                                                                                                                            
CLRVersion                     4.0.30319.42000                                                                                                                                                                                           
WSManStackVersion              3.0                                                                                                                                                                                                       
PSRemotingProtocolVersion      2.3                                                                                                                                                                                                       
SerializationVersion           1.1.0.1



PS c:\> Get-Module poshrsjob

ModuleType Version    Name                                ExportedCommands                                                                                                                                                               
---------- -------    ----                                ----------------                                                                                                                                                               
Script     1.7.2.9    PoshRSJob                           {Get-RSJob, Receive-RSJob, Remove-RSJob, Start-RSJob...}                                                                                                                       

#>

<#
    Strangely enought, in my actual script I'm passing in an array of AD users and another array and comparing properties of each:

    foreach ($ADUser in $ADUsers) {if ($DBUser.EmployeeID -eq $ADUser.EmployeeID) {<Do something>}}

    The if block never executes because $ADUser.EmployeeID is always null.
#>

I'm seeing a similar issue with PoshRSJob 1.7.4.4

Outside the RSJobs, I'm passing in an ADUSer object with HomeDirectory and Department properties, but inside each RSJob, the two extra properties are gone.