https://git.ruby-lang.org/ruby.git/commit/?id=19006b711d

From 19006b711d8649b69d6f9dafad073a2f57201dd7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 2 Aug 2019 11:28:24 +0900
Subject: Expanded f_quo


diff --git a/rational.c b/rational.c
index 1dc08a0..fdaf4d6 100644
--- a/rational.c
+++ b/rational.c
@@ -1602,7 +1602,16 @@ f_ceil(VALUE x) https://github.com/ruby/ruby/blob/trunk/rational.c#L1602
 }
 
 #define id_quo rb_intern("quo")
-#define f_quo(x,y) rb_funcall((x), id_quo, 1, (y))
+static VALUE
+f_quo(VALUE x, VALUE y)
+{
+    if (RB_INTEGER_TYPE_P(x))
+        return rb_int_div(x, y);
+    if (RB_FLOAT_TYPE_P(x))
+        return DBL2NUM(RFLOAT_VALUE(x) / RFLOAT_VALUE(y));
+
+    return rb_funcallv(x, id_quo, 1, &y);
+}
 
 #define f_reciprocal(x) f_quo(ONE, (x))
 
-- 
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