lolgzs/amber — comment on commit af6603074b5877c664128e82729ad9e58f675c20
File:  line 0
By lolgzs:

I suppose it's related to:
String>>asSelector

and in boot.js

function convertBinarySelector(selector) {
return selector
.replace(/^_/, '')
.replace(/_plus/, '+')
.replace(/_minus/, '-')
.replace(/_star/, '*')
.replace(/_slash/, '/')
.replace(/_gt/, '>')
.replace(/_lt/, '<')
.replace(/_eq/, '=')
.replace(/_comma/, ',')
.replace(/_at/, '@')
};

Isn't it ?