[issue37587] JSON loads performance improvement for long strings

[Inada Naoki]

Change by Inada Naoki <songofacandy at gmail.com>:


----------
versions:  -Python 3.6, Python 3.7, Python 3.8

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37587>
_______________________________________