[issue28638] Optimize namedtuple creation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Microbenchmark for caching docstrings:

$ ./python -m perf timeit -s "from collections import namedtuple; names = ['field%d' % i for i in range(1000)]" -- "namedtuple('A', names)"

With sys.intern(): Mean +- std dev: 3.57 ms +- 0.05 ms
With Python-level caching: Mean +- std dev: 3.25 ms +- 0.05 ms

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<https://bugs.python.org/issue28638>
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