The executor system was built around passing only a single
argument to workers, which was
always PageContext. For other tasks, all actual arguments were packed in
a tuple, which meant we needed intermediate functions to unpack the
tuple.
The situation is now rationlized and resembles how Python handles
argument passing to familiar multiprocessing tools.
Now all tests pass, except for:
-tests that check the progress bar
-tests where xdist may or may not load a _lambda_plugin by running
some other test first before a test in optimize
James R. Barlow