lib: add support for bigint in querystring

Add support for bigint in strgify for querystring method.
This use the same method as the number but escapes the exponential
notation method as bigint does not play well with the numbers. Instead
in case of stringification there is a separate condition clause to
filter out bigint.

Fixes: nodejs#36080

lib/querystring.js

@@ -158,7 +158,8 @@ function qsEscape(str) {
 function stringifyPrimitive(v) {
   if (typeof v === 'string')
     return v;
-  if (typeof v === 'number' && NumberIsFinite(v))
+  if ((typeof v === 'number' && NumberIsFinite(v)) ||
+      (typeof v === 'bigint'))
     return '' + v;
   if (typeof v === 'boolean')
     return v ? 'true' : 'false';
@@ -174,6 +175,8 @@ function encodeStringified(v, encode) {
     // escaping due to the inclusion of a '+' in the output
     return (MathAbs(v) < 1e21 ? '' + v : encode('' + v));
   }
+  if (typeof v === 'bigint')
+    return '' + v;
   if (typeof v === 'boolean')
     return v ? 'true' : 'false';
   return '';

test/parallel/test-querystring.js

@@ -44,6 +44,9 @@ const qsTestCases = [
   ['__defineGetter__=asdf',
    '__defineGetter__=asdf',
    JSON.parse('{"__defineGetter__":"asdf"}')],
+  ['foo=12345678901234567',
+   'foo=12345678901234567',
+   { 'foo': 12345678901234567n }],
   ['foo=918854443121279438895193',
    'foo=918854443121279438895193',
    { 'foo': '918854443121279438895193' }],