From dc758d2884f390d7ad6667477a973fda920cd731 Mon Sep 17 00:00:00 2001
From: Mog Nesbitt <mog@seriousorange.com>
Date: Sun, 16 Jun 2024 14:22:17 +1200
Subject: [PATCH] Explicitly unfreeze strings used by parser

---
 lib/prawn/svg/css/values_parser.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/prawn/svg/css/values_parser.rb b/lib/prawn/svg/css/values_parser.rb
index 739a72c..dd7f03f 100644
--- a/lib/prawn/svg/css/values_parser.rb
+++ b/lib/prawn/svg/css/values_parser.rb
@@ -34,7 +34,7 @@ def parse_function_call(name, rest)
         arguments = []
         in_quote = nil
         in_escape = false
-        current = ''
+        current = +''
 
         rest.each_char.with_index do |char, index|
           if in_escape
@@ -52,7 +52,7 @@ def parse_function_call(name, rest)
             in_escape = true
           elsif in_quote.nil? && char == ','
             arguments << current.strip
-            current = ''
+            current = +''
           elsif in_quote.nil? && char == ')'
             arguments << current.strip
             return [[name, arguments], rest[index + 1..]]