From b9f8c962a6ced8ea483bb9b0db54e32d13005a57 Mon Sep 17 00:00:00 2001
From: Daniel Alarcon Amador <daniel@passionatepeople.io>
Date: Thu, 5 Dec 2019 10:09:59 +0100
Subject: [PATCH 1/2] fix(fieldset): 0 is now a valid serializedValue

---
 packages/fieldset/src/LionFieldset.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/fieldset/src/LionFieldset.js b/packages/fieldset/src/LionFieldset.js
index cfccbd53a..99c84519b 100644
--- a/packages/fieldset/src/LionFieldset.js
+++ b/packages/fieldset/src/LionFieldset.js
@@ -210,7 +210,7 @@ export class LionFieldset extends FormRegistrarMixin(
         serializedValues[name] = this.__serializeElements(element);
       } else {
         const serializedValue = this.__serializeElement(element);
-        if (serializedValue) {
+        if (serializedValue || serializedValue === 0) {
           serializedValues[name] = serializedValue;
         }
       }
@@ -353,7 +353,7 @@ export class LionFieldset extends FormRegistrarMixin(
     const serializedValues = [];
     elements.forEach(element => {
       const serializedValue = this.__serializeElement(element);
-      if (serializedValue) {
+      if (serializedValue || serializedValue === 0) {
         serializedValues.push(serializedValue);
       }
     });

From c1f35030bd2c6849facc79f9c79dd8c45eac5419 Mon Sep 17 00:00:00 2001
From: Daniel Alarcon Amador <daniel@passionatepeople.io>
Date: Thu, 5 Dec 2019 12:10:40 +0100
Subject: [PATCH 2/2] chore(fieldset): added missing tests for
 serializeGroup/Elements

---
 packages/fieldset/test/lion-fieldset.test.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/packages/fieldset/test/lion-fieldset.test.js b/packages/fieldset/test/lion-fieldset.test.js
index 1c6b82668..0ae6d64c2 100644
--- a/packages/fieldset/test/lion-fieldset.test.js
+++ b/packages/fieldset/test/lion-fieldset.test.js
@@ -566,6 +566,23 @@ describe('<lion-fieldset>', () => {
       });
     });
 
+    it('0 is a valid value to be serialized', async () => {
+      const fieldset = await fixture(html`
+      <${tag}>
+        <${childTag} name="price"></${childTag}>
+      </${tag}>`);
+      await nextFrame();
+      fieldset.formElements.price.modelValue = 0;
+      expect(fieldset.serializeGroup()).to.deep.equal({ price: 0 });
+    });
+
+    it('__serializeElements serializes 0 as a valid value', async () => {
+      const fieldset = await fixture(html`<${tag}></${tag}>`);
+      await nextFrame();
+      const elements = [{ serializedValue: 0 }];
+      expect(fieldset.__serializeElements(elements)).to.deep.equal([0]);
+    });
+
     it('form elements which are not disabled', async () => {
       const fieldset = await fixture(html`<${tag}>${inputSlots}</${tag}>`);
       await nextFrame();