lib/utils.js
function _boolToNum(value, numTrue, numFalse, defaultVal) {
        if (typeof value === 'boolean') {
            return value ? numTrue : numFalse;
        }
        return typeof value === 'number' ? value : defaultVal;
    }
function _boolToNum(value, numTrue, numFalse, defaultVal) {
        if (typeof value === 'boolean') {
            return value ? numTrue : numFalse;
        }
        return typeof value === 'number' ? value : defaultVal;
    }
Normalizes and tries to get a numeric value. This is used for options that support both Boolean and Number values.