From 3b2c4462bdd854c65ef5b0e6ec8b0e9dff04c3fa Mon Sep 17 00:00:00 2001
From: Russell Bicknell <bicknellr@google.com>
Date: Fri, 30 Oct 2020 17:52:38 -0700
Subject: [PATCH 1/2] Remove a `test.only` in the lit-html tests.

---
 packages/lit-html/src/test/lit-html_test.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/lit-html/src/test/lit-html_test.ts b/packages/lit-html/src/test/lit-html_test.ts
index 3609b75764..c3fc42be39 100644
--- a/packages/lit-html/src/test/lit-html_test.ts
+++ b/packages/lit-html/src/test/lit-html_test.ts
@@ -1731,7 +1731,7 @@ suite('lit-html', () => {
       assert.strictEqual((container.firstElementChild as any).foo, 'A:1');
     });
 
-    test.only('renders directives on EventParts', () => {
+    test('renders directives on EventParts', () => {
       const handle = directive(
         class extends Directive {
           count = 0;

From 0559f0fc287380f94632db9152637dabee4f00ca Mon Sep 17 00:00:00 2001
From: Kevin Schaaf <kschaaf@google.com>
Date: Mon, 2 Nov 2020 15:10:14 -0800
Subject: [PATCH 2/2] Restore coercing null/undefined to empty string when
 concatenating

---
 packages/lit-html/src/lit-html.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/lit-html/src/lit-html.ts b/packages/lit-html/src/lit-html.ts
index 775e656837..7e20939dd0 100644
--- a/packages/lit-html/src/lit-html.ts
+++ b/packages/lit-html/src/lit-html.ts
@@ -1181,7 +1181,7 @@ export class AttributePart {
           (this._value as Array<unknown>)[i] = v;
         }
         attributeValue +=
-          (typeof v === 'string' ? v : String(v)) + strings[i + 1];
+          (typeof v === 'string' ? v : String(v ?? '')) + strings[i + 1];
       }
       if (change && !noCommit) {
         this._commitValue(remove ? nothing : attributeValue);