Problem with iPgm parameters in python-itoolkit

parm_test.py

from itoolkit import iToolKit, iPgm, iData
try:
    # The following uses pyodbc, which is the preferred way to connect
    # from Windows or Linux.
    import pyodbc
    from itoolkit.odbc.iodbccall import iODBCCall as DatabaseTransport
except ModuleNotFoundError:
    # The following uses ibm_db, which is the preferred way to connect
    # from PASE.
    pyodbc = None
    from itoolkit.db2.idb2call import iDB2Call as DatabaseTransport

LIBRARY = 'MYLIB'  # adjust this yourself

def new_transport():
    if pyodbc:
        # Adjust these yourself as necessary.
        return DatabaseTransport(pyodbc.connect(
            driver='{iSeries Access ODBC Driver}',
            system='1.2.3.4',
            uid='username',
            pwd='password'))
    return DatabaseTransport()

def zero(trans):
    print('zero...')
    itool = iToolKit(irow=False)
    itool.clear()
    itool.add(iPgm('pgm', 'PARMCOUNT', {'lib': LIBRARY}))
    print(itool.xml_in())
    itool.call(trans)
    print(itool.dict_out('pgm'))

def one(trans):
    print('one...')
    itool = iToolKit(irow=False)
    itool.clear()
    itool.add(iPgm('pgm', 'PARMCOUNT', {'lib': LIBRARY})
        .addParm(iData('p1', '1a', '')))
    print(itool.xml_in())
    itool.call(trans)
    print(itool.dict_out('pgm'))

def two(trans):
    print('two...')
    itool = iToolKit(irow=False)
    itool.clear()
    itool.add(iPgm('pgm', 'PARMCOUNT', {'lib': LIBRARY})
        .addParm(iData('p1', '1a', ''))
        .addParm(iData('p2', '1a', '')))
    print(itool.xml_in())
    itool.call(trans)
    print(itool.dict_out('pgm'))

zero(new_transport())
two(new_transport())
one(new_transport())
zero(new_transport())  # zombie parameter?
zero(new_transport())  # zombie parameter still alive?

print('Done.')

PARMCOUNT.rpgle

      *----------------------------------------------------------------*
     D parms           s              3  0                              
      *----------------------------------------------------------------*
     C                   eval      parms = %parms                       
     C     parms         dsply                                          
     C                   return                                         
      *----------------------------------------------------------------*