From 4b9b6375d8deb855eaed44a48daa808c753a93a8 Mon Sep 17 00:00:00 2001
From: aleclarson <alec.stanford.larson@gmail.com>
Date: Sat, 15 Dec 2018 20:24:37 -0500
Subject: [PATCH] perf(proxy): avoid `has` where possible

---
 src/immer.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/immer.js b/src/immer.js
index 53346569..941978be 100644
--- a/src/immer.js
+++ b/src/immer.js
@@ -4,7 +4,6 @@ import {generatePatches} from "./patches"
 import {
     assign,
     each,
-    has,
     is,
     isDraft,
     isDraftable,
@@ -174,7 +173,7 @@ export class Immer {
                 // prettier-ignore
                 parent[prop] =
                     // Patches are never generated for assigned properties.
-                    patches && parent === root && !(state && has(state.assigned, prop))
+                    patches && parent === root && !(state && state.assigned[prop])
                         ? this.finalize(value, path.concat(prop), patches, inversePatches)
                         : this.finalize(value)