fix: recursive opts parsing

Author: niinpatel

src/core/runtime/dns-nodejs.js

@@ -9,7 +9,7 @@ const MAX_RECURSIVE_DEPTH = 32
 
 module.exports = (domain, opts, callback) => {
   // recursive is true by default, it's set to false only if explicitly passed as argument in opts
-  const recursive = opts.recursive.toString() !== 'false'
+  const recursive = opts.recursive == null || opts.recursive.toString() !== 'false'
 
   let depth
   if (recursive) {