keys: Use trichotomic comparators where possible
keys: Use trichotomic comparators where possible

Trichotomic version reduces comparison count almost by half.

guiquanz/scylla,respu/scylla,capturePointer/scylla,rluta/scylla,raphaelsc/scylla,raphaelsc/scylla,justintung/scylla,aruanruan/scylla,asias/scylla,avikivity/scylla,guiquanz/scylla,rentongzhang/scylla,senseb/scylla,eklitzke/scylla,kangkot/scylla,linearregression/scylla,scylladb/scylla,stamhe/scylla,dwdm/scylla,stamhe/scylla,bowlofstew/scylla,raphaelsc/scylla,dwdm/scylla,rentongzhang/scylla,kjniemi/scylla,victorbriz/scylla,aruanruan/scylla,glommer/scylla,shaunstanislaus/scylla,scylladb/scylla,capturePointer/scylla,guiquanz/scylla,wildinto/scylla,capturePointer/scylla,gwicke/scylla,shaunstanislaus/scylla,respu/scylla,asias/scylla,justintung/scylla,avikivity/scylla,acbellini/scylla,justintung/scylla,kjniemi/scylla,asias/scylla,shaunstanislaus/scylla,rluta/scylla,glommer/scylla,tempbottle/scylla,respu/scylla,kjniemi/scylla,eklitzke/scylla,kangkot/scylla,bowlofstew/scylla,scylladb/scylla,victorbriz/scylla,gwicke/scylla,avikivity/scylla,victorbriz/scylla,kangkot/scylla,tempbottle/scylla,acbellini/scylla,aruanruan/scylla,wildinto/scylla,linearregression/scylla,scylladb/scylla,linearregression/scylla,bowlofstew/scylla,senseb/scylla,senseb/scylla,duarten/scylla,stamhe/scylla,phonkee/scylla,gwicke/scylla,wildinto/scylla,rluta/scylla,eklitzke/scylla,duarten/scylla,acbellini/scylla,phonkee/scylla,glommer/scylla,dwdm/scylla,duarten/scylla,tempbottle/scylla,phonkee/scylla,rentongzhang/scylla