damccorm opened a new issue, #20942:
URL: https://github.com/apache/beam/issues/20942
if kw args of process function are declared before DnFnParam placeholders
the fulfillment will shift to wrong index unexpectedly.
For example if process has signature
```
def process(element, an_arg='x', w=DoFn.WindowParam):
window_start_1 = an_arg.start // this is
ok, though unexpectedly
window_start_2 = w.start // this is not ok, also unexpectedly, value of
w is shifted onto an_arg, and w is DoFn.WindowParam, it throws exception
_DoFnParam has no attribute
'start'.
...
```
at runtime the window param will be mapped onto 'an_arg' instead of w, and w
will not be replaced with runtime value, causing confusing behaviors. (e.g.
an_arg will be an instance of GlobalWindow or FixedWindow but w is still
DoFn.WindowParam).
Imported from Jira
[BEAM-12446](https://issues.apache.org/jira/browse/BEAM-12446). Original Jira
may contain additional context.
Reported by: yichi.
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