From e61fb2cf04de817485483cf27a24a789ef2c6441 Mon Sep 17 00:00:00 2001
From: Kyle Upton <kyleaupton@gmail.com>
Date: Tue, 13 Feb 2024 16:47:28 -0500
Subject: [PATCH 1/2] fix: coerce undefined to string (#680)

---
 lib/serializer.js  |  2 +-
 test/array.test.js | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/lib/serializer.js b/lib/serializer.js
index 922be357..bea1979e 100644
--- a/lib/serializer.js
+++ b/lib/serializer.js
@@ -100,7 +100,7 @@ module.exports = class Serializer {
 
   asString (str) {
     if (typeof str !== 'string') {
-      if (str === null) {
+      if (str === null || str === undefined) {
         return '""'
       }
       if (str instanceof Date) {
diff --git a/test/array.test.js b/test/array.test.js
index fbffe02f..c9bbc671 100644
--- a/test/array.test.js
+++ b/test/array.test.js
@@ -195,6 +195,34 @@ buildTest({
   '@data': ['test']
 })
 
+test('array of strings with null and undefined elements coerced to empty string', (t) => {
+  t.plan(1)
+
+  const schema = {
+    type: 'object',
+    properties: {
+      foo: {
+        type: 'array',
+        items: {
+          type: 'string'
+        }
+      }
+    }
+  }
+
+  const stringify = build(schema)
+  const result = stringify({
+    foo: [
+      'foo',
+      'bar',
+      null,
+      undefined
+    ]
+  })
+
+  t.equal(result, '{"foo":["foo","bar","",""]}')
+})
+
 test('invalid items throw', (t) => {
   t.plan(1)
   const schema = {

From 92fe231acdce57b6fd7430c28f9cc61e887caacb Mon Sep 17 00:00:00 2001
From: Kyle Upton <44348980+kyleaupton@users.noreply.github.com>
Date: Wed, 14 Feb 2024 10:24:49 -0500
Subject: [PATCH 2/2] Update lib/serializer.js
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Gürgün Dayıoğlu <hey@gurgun.day>
Signed-off-by: Kyle Upton <44348980+kyleaupton@users.noreply.github.com>
---
 lib/serializer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/serializer.js b/lib/serializer.js
index bea1979e..21e06729 100644
--- a/lib/serializer.js
+++ b/lib/serializer.js
@@ -100,7 +100,7 @@ module.exports = class Serializer {
 
   asString (str) {
     if (typeof str !== 'string') {
-      if (str === null || str === undefined) {
+      if (str == null) {
         return '""'
       }
       if (str instanceof Date) {