From 59e18e54781564417e22a97d2eab5520e5661a5c Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 11 Oct 2019 18:59:39 -0400
Subject: [PATCH] fix(runtime-dom): cast  to true for boolean props

---
 packages/runtime-dom/src/modules/props.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/runtime-dom/src/modules/props.ts b/packages/runtime-dom/src/modules/props.ts
index 0e87ffcd1e..fbaaac2c8e 100644
--- a/packages/runtime-dom/src/modules/props.ts
+++ b/packages/runtime-dom/src/modules/props.ts
@@ -18,5 +18,10 @@ export function patchDOMProp(
     // non-string values will be stringified.
     el._value = value
   }
-  el[key] = value == null ? '' : value
+  if (value === '' && typeof el[key] === 'boolean') {
+    // e.g. <select multiple> compiles to { multiple: '' }
+    el[key] = true
+  } else {
+    el[key] = value == null ? '' : value
+  }
 }
-- 
2.47.3