[issue37587] JSON loads performance improvement for long strings

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I went ahead and merged the minimal PR and flagged it for backporting to 3.8 - it's an obviously beneficial change, that clearly does less work on each pass through the loop.

Even if you are doing non-strict parsing of a string that consists entirely of invalid characters, you'll get the same level of performance that the previous code offered for all strict parsing.

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