https://git.ruby-lang.org/ruby.git/commit/?id=6de61fb9ed

From 6de61fb9edf77d69e93cca8e4166b51b07c71c06 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 2 Aug 2019 11:19:29 +0900
Subject: Expanded f_mod


diff --git a/rational.c b/rational.c
index 7113e15..0f3cee7 100644
--- a/rational.c
+++ b/rational.c
@@ -43,13 +43,6 @@ static ID id_abs, id_idiv, id_integer_p, https://github.com/ruby/ruby/blob/trunk/rational.c#L43
 
 static VALUE nurat_to_f(VALUE self);
 
-#define binop(n,op) \
-inline static VALUE \
-f_##n(VALUE x, VALUE y)\
-{\
-    return rb_funcall(x, (op), 1, y); \
-}
-
 #define fun1(n) \
 inline static VALUE \
 f_##n(VALUE x)\
@@ -87,7 +80,13 @@ f_lt_p(VALUE x, VALUE y) https://github.com/ruby/ruby/blob/trunk/rational.c#L80
 
 #ifndef NDEBUG
 /* f_mod is used only in f_gcd defined when NDEBUG is not defined */
-binop(mod, '%')
+inline static VALUE
+f_mod(VALUE x, VALUE y)
+{
+    if (RB_INTEGER_TYPE_P(x))
+        return rb_int_modulo(x, y);
+    return rb_funcall(x, '%', 1, y);
+}
 #endif
 
 inline static VALUE
-- 
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