Mark Shannon <m...@hotpy.org> added the comment:

I've not measured performance, as the sort of large literals it would impact 
are very rare, and the sort of calls it would change are almost non-existent.

I'd be surprised if any performance difference could be reliably detected with 
our current performance tools.

This change is an enabler of future optimizations, such as using a contiguous 
data stack. The impact of those optimizations will swamp any impact of this 
change, and should be easily measurable.

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<https://bugs.python.org/issue43846>
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