[ruby/openssl] ssl: align #write and #<< with IO

IO#write and IO#<< convert the arguments to String with #to_s. RDoc
comments for OpenSSL::Buffering#write also stated this, but they do not
actually convert. Fix this.

OpenSSL::Buffering#puts and #print already correctly call #to_s.

https://github.com/ruby/openssl/commit/a801f1e957

ext/openssl/lib/openssl/buffering.rb

@@ -463,10 +463,13 @@ module OpenSSL::Buffering
   # converted using +.to_s+ method.  Returns the number of bytes written.
 
   def write(*s)
-    s.inject(0) do |written, str|
+    written = 0
+    s.each do |str|
+      str = str.to_s
       do_write(str)
-      written + str.bytesize
+      written += str.bytesize
     end
+    written
   end
 
   ##
@@ -516,7 +519,7 @@ module OpenSSL::Buffering
   # +.to_s+ method.
 
   def <<(s)
-    do_write(s)
+    do_write(s.to_s)
     self
   end
 

test/openssl/test_pair.rb

@@ -600,6 +600,16 @@ module OpenSSL::TestPairM
     }
   end
 
+  def test_write_ltlt_convert_to_s
+    ssl_pair {|s1, s2|
+      def (obj = Object.new).to_s() "obj" end
+      assert_equal(6, s1.write("str", obj))
+      assert_same(s1, s1 << obj)
+      s1.close
+      assert_equal("strobjobj", s2.read)
+    }
+  end
+
   def test_write_zero
     ssl_pair {|s1, s2|
       assert_equal 0, s2.write_nonblock('', exception: false)