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Thanks. PEP 304 is a bit different.  It is specifying the
ability to read and write bytecode to a different directory
structure while this is specifying that bytecode, once
written is taken as canoncical even when options on the
python commandline would change the bytecode that is written.

Another solution in addition to those above would be writing
files with different extensions for different optimization
levels although this seems worse than either of the other
two changes.