numeric.c: allow nil as rounding mode option

* numeric.c (rb_num_get_rounding_option): allow nil same as the
  default behavior, per [ruby-core:77961].  [Bug #12548]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/numeric.c b/numeric.c
index 17d15f6c92..dabcdc39de 100644
--- a/numeric.c
+++ b/numeric.c
@@ -209,6 +209,9 @@ rb_num_get_rounding_option(VALUE opts)
 	if (SYMBOL_P(rounding)) {
 	    str = rb_sym2str(rounding);
 	}
+	else if (NIL_P(rounding)) {
+	    goto noopt;
+	}
 	else if (!RB_TYPE_P(str = rounding, T_STRING)) {
 	    str = rb_check_string_type(rounding);
 	    if (NIL_P(str)) goto invalid;