Stupid powershell returns object[] instead of string

gistfile1.txt

function Trigger-Builds($WaitForCore = $True) {
   $ServiceUrl = 'http://jenkins:8080/job/e3.components.omt.services.OrderService.v1.1'
   $LastServiceBuildNumber = Get-LastSuccessfulBuildNumber "$ServiceUrl/rssAll"

   $ServiceVersion = 0
   $ServiceBuildResult = Trigger-Build "$ServiceUrl/build"
   Write-Host "Building service now.."

   while ($ServiceBuildResult) {
      Sleep -Seconds 20
      $Version = Get-LatestVersionAfter $LastServiceBuildNumber "$ServiceUrl/rssAll"
      Write-Host "Latest version after $LastServiceBuildNumber is $Version"

      if ($Version -ge 0) {
         $ServiceVersion = $Version
         break
      }
   }

   Write-Host $ServiceVersion.GetType() # this is string
   return $ServiceVersion # this becomes an array, but at this point it's still a string..
}

$v = Trigger-Builds $False
$v.GetType() # this is object[]