Optimize _loader/types.py

Benjamin Schubertrequested to merge
bschubert/optimize-loader-types into master

Description

Move _loader/types.py to Cython

Benchmarks

commit action python_version max_memory time
master - bf8c33a1 show py37 1403 69.5
bschubert/optimize-loader-types - e61600d6 show py37 1404 69

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