From df3f232448852b58fb8e4793cf5e8eaa64d5f78e Mon Sep 17 00:00:00 2001
From: Hunter Wilhelm <71348224+hunterwilhelm@users.noreply.github.com>
Date: Fri, 19 Dec 2025 09:28:27 -0700
Subject: [PATCH] Fixes FIX-207: enables Decimal.sum(...[]) to return 0 instead
 throwing an error

---
 decimal.js          | 3 ++-
 decimal.mjs         | 3 ++-
 test/modules/sum.js | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/decimal.js b/decimal.js
index f7ecafb..eaee534 100644
--- a/decimal.js
+++ b/decimal.js
@@ -4861,7 +4861,8 @@
   function sum() {
     var i = 0,
       args = arguments,
-      x = new this(args[i]);
+      firstArg = args[i],
+      x = new this(firstArg === undefined ? 0 : firstArg);
 
     external = false;
     for (; x.s && ++i < args.length;) x = x.plus(args[i]);
diff --git a/decimal.mjs b/decimal.mjs
index 18dc640..dd1cb76 100644
--- a/decimal.mjs
+++ b/decimal.mjs
@@ -4856,7 +4856,8 @@ function sub(x, y) {
 function sum() {
   var i = 0,
     args = arguments,
-    x = new this(args[i]);
+    firstArg = args[i],
+    x = new this(firstArg === undefined ? 0 : firstArg);
 
   external = false;
   for (; x.s && ++i < args.length;) x = x.plus(args[i]);
diff --git a/test/modules/sum.js b/test/modules/sum.js
index 6dda6f0..e14c0ff 100644
--- a/test/modules/sum.js
+++ b/test/modules/sum.js
@@ -16,7 +16,8 @@ T('sum', function () {
   t(11, -11);
   t(1, '2', new Decimal(3), new Decimal('4'), -10);
   t(new Decimal(-10), '9', new Decimal(0.01), 0.99);
-  
+  t();
+
   expected = new Decimal(10);
 
   t('10');