lib/script/nej/util.js
function(result,exp){
                switch(exp.op){
                    case '<':
                    case '<=':
                        result.lower = exp;
                    break;
                    case '>':
                    case '>=':
                        result.upper = exp;
                    break;
                    case '=':
                    case '==':
                        result.midle = exp;
                    break;
                }
                delete exp.op;
            }
function(result,exp){
                switch(exp.op){
                    case '<':
                    case '<=':
                        result.lower = exp;
                    break;
                    case '>':
                    case '>=':
                        result.upper = exp;
                    break;
                    case '=':
                    case '==':
                        result.midle = exp;
                    break;
                }
                delete exp.op;
            }
for 2.0a<= or 2.0a= or 2.0a>=