In the "Object Lifetime" section you say "registers should be cleared upon
last reference". That isn't safe, since there can be hidden dependencies on
side effects of __del__, e.g.:
process_objects = create_pipeline()
output_process = process_objects[-1]
return output_process.wait()
If the process class terminates the process in __del__ (PyQt5's QProcess
does), then implicitly deleting process_objects after the second line will
break the code.
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