files and not re-optimized upon import. Saves a bit of startup time while
still remaining decoupled from the rest of the compiler.
As a side benefit, handcoded bytecode is not run through the optimizer
when new code objects are created. Hopefully, a handcoder has already
created exactly what they want to have run.
(Idea suggested by Armin Rigo and Michael Hudson. Initially avoided
because of worries about compiler coupling; however, only the nexus
point needed to be moved so there won't be a conflict when the AST
branch is loaded.)
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