From 545c48a37bc105183335644485a1f3a8558e89be Mon Sep 17 00:00:00 2001
From: Matthew Keeler <mkeeler@launchdarkly.com>
Date: Tue, 15 Jul 2025 10:39:51 -0400
Subject: [PATCH] fix: Update `force_encoding` to operate on unfrozen string

Similar to the work done in ccf79af, we are updating this library to
handle the upcoming change where strings are frozen by default.
---
 lib/ld-eventsource/impl/buffered_line_reader.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/ld-eventsource/impl/buffered_line_reader.rb b/lib/ld-eventsource/impl/buffered_line_reader.rb
index 6f6f0e8..7f37dd9 100644
--- a/lib/ld-eventsource/impl/buffered_line_reader.rb
+++ b/lib/ld-eventsource/impl/buffered_line_reader.rb
@@ -22,8 +22,8 @@ def self.lines_from(chunks)
 
         Enumerator.new do |gen|
           chunks.each do |chunk|
-            chunk.force_encoding("ASCII-8BIT")
-            buffer << chunk
+            chunk = chunk.dup.force_encoding("ASCII-8BIT")
+            buffer += chunk
 
             loop do
               # Search for a line break in any part of the buffer that we haven't yet seen.