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Hmm. In the (simplistic) case I was trying, I can't see any 
significant difference between the lambda and the 
equivalent function (names differ, and the func has 2 
appended & apparently unreachable bytecodes, but otherwise 
the func_* and func_code.co_* attributes match). So what am 
I missing?

Lowering priority - I can live without it easily enough.

But if lambda's won't load, they probably shouldn't dump.