https://git.ruby-lang.org/ruby.git/commit/?id=f9a0492b76

From f9a0492b76956b545c746ab0d3ec0e555e77dfcd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 2 Aug 2019 11:25:41 +0900
Subject: Expanded f_ceil


diff --git a/internal.h b/internal.h
index fac8ece..5ecb229 100644
--- a/internal.h
+++ b/internal.h
@@ -1772,6 +1772,7 @@ VALUE rb_int_odd_p(VALUE num); https://github.com/ruby/ruby/blob/trunk/internal.h#L1772
 int rb_int_positive_p(VALUE num);
 int rb_int_negative_p(VALUE num);
 VALUE rb_num_pow(VALUE x, VALUE y);
+VALUE rb_float_ceil(VALUE num, int ndigits);
 
 static inline VALUE
 rb_num_compare_with_zero(VALUE num, ID mid)
diff --git a/numeric.c b/numeric.c
index 5b0ab8c..7ce6590 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2002,12 +2002,19 @@ flo_floor(int argc, VALUE *argv, VALUE num) https://github.com/ruby/ruby/blob/trunk/numeric.c#L2002
 static VALUE
 flo_ceil(int argc, VALUE *argv, VALUE num)
 {
-    double number, f;
     int ndigits = 0;
 
     if (rb_check_arity(argc, 0, 1)) {
 	ndigits = NUM2INT(argv[0]);
     }
+    return rb_float_ceil(num, ndigits);
+}
+
+VALUE
+rb_float_ceil(VALUE num, int ndigits)
+{
+    double number, f;
+
     number = RFLOAT_VALUE(num);
     if (number == 0.0) {
 	return ndigits > 0 ? DBL2NUM(number) : INT2FIX(0);
diff --git a/rational.c b/rational.c
index 3737db4..1dc08a0 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 fun1(n) \
-inline static VALUE \
-f_##n(VALUE x)\
-{\
-    return rb_funcall(x, id_##n, 0);\
-}
-
 inline static VALUE
 f_add(VALUE x, VALUE y)
 {
@@ -1597,7 +1590,16 @@ nurat_to_r(VALUE self) https://github.com/ruby/ruby/blob/trunk/rational.c#L1590
 }
 
 #define id_ceil rb_intern("ceil")
-#define f_ceil(x) rb_funcall((x), id_ceil, 0)
+static VALUE
+f_ceil(VALUE x)
+{
+    if (RB_INTEGER_TYPE_P(x))
+        return x;
+    if (RB_FLOAT_TYPE_P(x))
+        return rb_float_ceil(x, 0);
+
+    return rb_funcall(x, id_ceil, 0);
+}
 
 #define id_quo rb_intern("quo")
 #define f_quo(x,y) rb_funcall((x), id_quo, 1, (y))
-- 
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