From ee1e0fc0b105977d1959fab6d9e1e79d45c21409 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <Alexey.Andreev@jetbrains.com>
Date: Fri, 10 Feb 2017 20:19:58 +0300
Subject: [PATCH] JS: minor optimization: when attempting to set default value
 to MetadataProperty, remove value from underlying map

---
 .../kotlin/js/backend/ast/metadata/MetadataProperty.kt     | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/metadata/MetadataProperty.kt b/js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/metadata/MetadataProperty.kt
index 1e1fc99b51c..e107e778148 100644
--- a/js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/metadata/MetadataProperty.kt
+++ b/js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/metadata/MetadataProperty.kt
@@ -25,6 +25,11 @@ class MetadataProperty<in T : HasMetadata, R>(val default: R) {
     }
 
     operator fun setValue(thisRef: T, desc: KProperty<*>, value: R) {
-        thisRef.setData(desc.name, value)
+        if (value == default) {
+            thisRef.removeData(desc.name)
+        }
+        else {
+            thisRef.setData(desc.name, value)
+        }
     }
 }