docs: function qlnorm(meanlog, sdlog, lowerTail, logp) {
        var qnorm;
  
        logp = logp === true;
        lowerTail = lowerTail !== false;
        qnorm = normal.qnorm(meanlog, sdlog, lowerTail, logp);
  
        if (utils.hasNaN(meanlog, sdlog)) {
           return function() { return NaN; };
        }
  
        return utils.qhelper(lowerTail, logp, 0, Infinity,
           function(p) { return Math.exp(qnorm(p)); }
        );
     }