https://git.ruby-lang.org/ruby.git/commit/?id=1bdabaa6b1

From 1bdabaa6b13344c195698ca5b0ced323cb93e2e1 Mon Sep 17 00:00:00 2001
From: Konstantin Papkovskiy <konstantin@p...>
Date: Tue, 15 Aug 2017 17:35:58 +0300
Subject: base64.rb: improve performance of Base64.urlsafe_encode64

* lib/base64.rb: avoid unnecessary memory allocations

diff --git a/lib/base64.rb b/lib/base64.rb
index 24f0b02..5c8df84 100644
--- a/lib/base64.rb
+++ b/lib/base64.rb
@@ -81,8 +81,9 @@ module Base64 https://github.com/ruby/ruby/blob/trunk/lib/base64.rb#L81
   # Note that the result can still contain '='.
   # You can remove the padding by setting +padding+ as false.
   def urlsafe_encode64(bin, padding: true)
-    str = strict_encode64(bin).tr("+/", "-_")
-    str = str.delete("=") unless padding
+    str = strict_encode64(bin)
+    str.tr!("+/", "-_")
+    str.delete!("=") unless padding
     str
   end
 
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