stats of pure Python fuzzy filter performance:
total items: 100257
[once]
====== vim ======
FUNCTION <SNR>37_ext_filter()
1 5.951908 <SNR>37_ext_filter()
====== nvim ======
FUNCTION <SNR>43_ext_filter()
1 6.592639 <SNR>43_ext_filter()
total items: 100257
total items: 100257
[multi]
====== vim ======
FUNCTION <SNR>37_ext_filter()
3 11.148641 <SNR>37_ext_filter()
====== nvim ======
FUNCTION <SNR>43_ext_filter()
3 12.655566 <SNR>43_ext_filter()
[bench100000]
====== vim ======
FUNCTION <SNR>23_ext_filter()
1 5.400793 <SNR>23_ext_filter()
====== nvim ======
FUNCTION <SNR>27_ext_filter()
1 5.921336 <SNR>27_ext_filter()