https://git.ruby-lang.org/ruby.git/commit/?id=da46b8d8e5

From da46b8d8e5d09f896fb1af5dabea12820f02b3d6 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Mon, 20 Dec 2021 12:17:38 +1300
Subject: Default `IO::Buffer#get_string` to use BINARY encoding.

---
 io_buffer.c                 | 2 +-
 test/ruby/test_io_buffer.rb | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/io_buffer.c b/io_buffer.c
index 075a9bfb786..63f5bd2c249 100644
--- a/io_buffer.c
+++ b/io_buffer.c
@@ -1125,7 +1125,7 @@ io_buffer_get_string(int argc, VALUE *argv, VALUE self) https://github.com/ruby/ruby/blob/trunk/io_buffer.c#L1125
 
     size_t offset = 0;
     size_t length = data->size;
-    rb_encoding *encoding = NULL;
+    rb_encoding *encoding = rb_ascii8bit_encoding();
 
     if (argc >= 1) {
         offset = NUM2SIZET(argv[0]);
diff --git a/test/ruby/test_io_buffer.rb b/test/ruby/test_io_buffer.rb
index 0a8685d9d53..f2b9ca45e13 100644
--- a/test/ruby/test_io_buffer.rb
+++ b/test/ruby/test_io_buffer.rb
@@ -71,7 +71,10 @@ class TestIOBuffer < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_io_buffer.rb#L71
 
   def test_file_mapped
     buffer = File.open(__FILE__) {|file| IO::Buffer.map(file)}
-    assert_include buffer.get_string, "Hello World"
+    contents = buffer.get_string
+
+    assert_include contents, "Hello World"
+    assert_equal Encoding::BINARY, contents.encoding
   end
 
   def test_file_mapped_invalid
-- 
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