https://git.ruby-lang.org/ruby.git/commit/?id=980f994b3b

From 980f994b3b349486c5e64b51241330d4c9fc63f1 Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Fri, 20 Nov 2020 16:58:02 -0500
Subject: [ruby/irb] Change context-mode's default to new mode 4.

This new mode uses a copy of the TOPLEVEL_BINDING. This is compatible with refinements (contrary to mode 3), while keeping nested IRB sessions separate

https://github.com/ruby/irb/commit/25c731cb2f

diff --git a/lib/irb/init.rb b/lib/irb/init.rb
index 48b669f..73ef420 100644
--- a/lib/irb/init.rb
+++ b/lib/irb/init.rb
@@ -108,7 +108,7 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/init.rb#L108
     @CONF[:PROMPT_MODE] = (STDIN.tty? ? :DEFAULT : :NULL)
     @CONF[:AUTO_INDENT] = true
 
-    @CONF[:CONTEXT_MODE] = 3 # use binding in function on TOPLEVEL_BINDING
+    @CONF[:CONTEXT_MODE] = 4 # use a copy of TOPLEVEL_BINDING
     @CONF[:SINGLE_IRB] = false
 
     @CONF[:LC_MESSAGES] = Locale.new
diff --git a/lib/irb/workspace.rb b/lib/irb/workspace.rb
index 97d3c5f..5a3a4bc 100644
--- a/lib/irb/workspace.rb
+++ b/lib/irb/workspace.rb
@@ -51,11 +51,13 @@ EOF https://github.com/ruby/ruby/blob/trunk/lib/irb/workspace.rb#L51
           end
           @binding = BINDING_QUEUE.pop
 
-        when 3	# binding in function on TOPLEVEL_BINDING(default)
+        when 3	# binding in function on TOPLEVEL_BINDING
           @binding = eval("self.class.remove_method(:irb_binding) if defined?(irb_binding); private; def irb_binding; binding; end; irb_binding",
                           TOPLEVEL_BINDING,
                           __FILE__,
                           __LINE__ - 3)
+        when 4  # binding is a copy of TOPLEVEL_BINDING (default)
+          @binding = TOPLEVEL_BINDING.dup
         end
       end
 
-- 
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