ListProcessesInGuest not accepting single pid argument

Hi,

I'm currently trying to grab some info about a process I started in a VM.
I start the command with StartProgramInGuest() and get a long back with the pid.

When I now try to get info about that pid, I get an error:

File "/usr/local/lib/python2.7/dist-packages/pyvmomi-5.5.0-py2.7.egg/pyVmomi/VmomiSupport.py", line 553, in <lambda>
File "/usr/local/lib/python2.7/dist-packages/pyvmomi-5.5.0-py2.7.egg/pyVmomi/VmomiSupport.py", line 361, in _InvokeMethod
File "/usr/local/lib/python2.7/dist-packages/pyvmomi-5.5.0-py2.7.egg/pyVmomi/VmomiSupport.py", line 917, in CheckField
TypeError: 'long' object is not iterable

I use it like this:

proc = self.content.guestOperationsManager.processManager.ListProcessesInGuest(vm=vm, auth=creds, pids=pid)

If I leave out the pids I get an object with all the processes running.

Currently trying to understand if this is a bug in my code or in pyvmomi.
But looking at the specs here, https://github.com/vmware/pyvmomi/blob/master/docs/vim/vm/guest/ProcessManager.rst#id5, I am using the correct arguments.

Start with ListProcessesInGuest and the argument validation shown in pyVmomi/VmomiSupport.py, then compare the pids parameter with docs/vim/vm/guest/ProcessManager.rst. Reproduce the call using a single pid and verify the expected behavior against a collection of pids. Done means the documented single-pid call no longer raises the iterable TypeError, with regression coverage if the repository provides tests for this API.