https://git.ruby-lang.org/ruby.git/commit/?id=1976b38f7a

From 1976b38f7a4e1884852653508ec1160c8b581363 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Sun, 12 Dec 2021 20:43:09 +0100
Subject: [rubygems/rubygems] Add support in binstubs for trampolining bundler

If `bundler _<version>_` is given, I guess the most reasonable approach
is to completely skip version switching, because the user is technically
opting out of it. But since binstubs completely remove this argument
from `ARGV` after processing it, we have no way of detecting that it was
actually passed in the first place in order to skip the feature. So we
set `BUNDLER_VERSION` explicitly in this case.

https://github.com/rubygems/rubygems/commit/e0f360d6d7
---
 lib/rubygems/installer.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index 8e3965ef92d..ab09c182805 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -768,7 +768,7 @@ str = ARGV.first https://github.com/ruby/ruby/blob/trunk/lib/rubygems/installer.rb#L768
 if str
   str = str.b[/\\A_(.*)_\\z/, 1]
   if str and Gem::Version.correct?(str)
-    version = str
+    #{explicit_version_requirement(spec.name)}
     ARGV.shift
   end
 end
@@ -791,6 +791,16 @@ Gem.use_gemdeps https://github.com/ruby/ruby/blob/trunk/lib/rubygems/installer.rb#L791
 TEXT
   end
 
+  def explicit_version_requirement(name)
+    code = "version = str"
+    return code unless name == "bundler"
+
+    code += <<-TEXT
+
+    ENV['BUNDLER_VERSION'] = str
+TEXT
+  end
+
   ##
   # return the stub script text used to launch the true Ruby script
 
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