From 0d1d77e551f6d44625937daab32c4c09ec48984f Mon Sep 17 00:00:00 2001
From: Youssef Makboul <youssef.makboul@shopify.com>
Date: Wed, 27 Nov 2024 16:00:48 -0500
Subject: [PATCH] use is_a instead of instance and ignore nils

---
 lib/liquid/tags/assign.rb | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/liquid/tags/assign.rb b/lib/liquid/tags/assign.rb
index 438533b0..2acfddb4 100644
--- a/lib/liquid/tags/assign.rb
+++ b/lib/liquid/tags/assign.rb
@@ -51,14 +51,16 @@ module Liquid
     private
 
     def assign_score_of(val)
-      if val.instance_of?(String)
+      return 0 if val.nil?
+
+      if val.is_a?(String)
         val.bytesize
-      elsif val.instance_of?(Array)
+      elsif val.is_a?(Array)
         sum = 1
         # Uses #each to avoid extra allocations.
         val.each { |child| sum += assign_score_of(child) }
         sum
-      elsif val.instance_of?(Hash)
+      elsif val.is_a?(Hash)
         sum = 1
         val.each do |key, entry_value|
           sum += assign_score_of(key)