def __init__(self, sigOrVal: Union[RtlSignal, Value],<EOL>skipPadding: bool=True,<EOL>fillup: bool=False):
self.it = walkFlattenFields(sigOrVal, skipPadding=skipPadding)<EOL>self.fillup = fillup<EOL>self.actuallyHave = <NUM_LIT:0><EOL>self.actual = None<EOL>self.actualOffset = <NUM_LIT:0><EOL>
:param skipPadding: if true padding is skipped in dense types