[Python-ideas] New PEP 550: Execution Context

[Guido van Rossum]

I may have missed this (I've just skimmed the doc), but what's the
rationale for making the EC an *immutable* mapping? It's impressive that
you managed to create a faster immutable dict, but why does the use case
need one?

-- 
--Guido van Rossum (python.org/~guido)
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