merge revision(s) 56980,56981: [Backport #13004]

	extension.rdoc: fix rb_get_kwargs [ci skip]

	* doc/extension.rdoc: [DOC] optional keyword arguments are
  defaulted to Qundef.  ignored keys are kept in the hash but a
  new Hash is not created.  [ruby-dev:49893] [Bug #13004]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@57346 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/class.c b/class.c
index a72f4dcebd..955059d777 100644
--- a/class.c
+++ b/class.c
@@ -2002,7 +2002,7 @@ rb_get_kwargs(VALUE keyword_hash, const ID *table, int required, int optional, V
 	}
     }
     if (!rest && keyword_hash) {
-	if (RHASH_SIZE(keyword_hash) > (unsigned int)j) {
+	if (RHASH_SIZE(keyword_hash) > (unsigned int)(values ? 0 : j)) {
 	    unknown_keyword_error(keyword_hash, table, required+optional);
 	}
     }