in src/lib/sortedList.js [144:160]
SortedList.prototype.keys = function(val, bsResult) {
var ret = [];
if (bsResult == null) bsResult = this.bsearch(val);
var pos = bsResult;
while (pos >= 0 && this._compare(this[pos], val) == 0) {
ret.push(pos);
pos--;
}
var len = this.length;
pos = bsResult+1;
while (pos < len && this._compare(this[pos], val) == 0) {
ret.push(pos);
pos++;
}
return ret.length ? ret : null;
};