https://git.ruby-lang.org/ruby.git/commit/?id=9efd590a13

From 9efd590a13d1e8b8a141c46eabb48c2a1c286d2b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 23 Jan 2021 11:04:45 +0900
Subject: Rationalize floats in coerce [Bug #17572]

---
 rational.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/rational.c b/rational.c
index 8548b3b..c7437df 100644
--- a/rational.c
+++ b/rational.c
@@ -51,6 +51,7 @@ static ID id_abs, id_integer_p, https://github.com/ruby/ruby/blob/trunk/rational.c#L51
 #define f_to_s rb_obj_as_string
 
 static VALUE nurat_to_f(VALUE self);
+static VALUE float_to_r(VALUE self);
 
 inline static VALUE
 f_add(VALUE x, VALUE y)
@@ -1172,11 +1173,17 @@ nurat_coerce(VALUE self, VALUE other) https://github.com/ruby/ruby/blob/trunk/rational.c#L1173
 	return rb_assoc_new(other, self);
     }
     else if (RB_TYPE_P(other, T_COMPLEX)) {
-	if (k_exact_zero_p(RCOMPLEX(other)->imag))
-	    return rb_assoc_new(f_rational_new_bang1
-				(CLASS_OF(self), RCOMPLEX(other)->real), self);
-	else
+	if (!k_exact_zero_p(RCOMPLEX(other)->imag))
 	    return rb_assoc_new(other, rb_Complex(self, INT2FIX(0)));
+        other = RCOMPLEX(other)->real;
+        if (RB_FLOAT_TYPE_P(other)) {
+            other = float_to_r(other);
+            RBASIC_SET_CLASS(other, CLASS_OF(self));
+        }
+        else {
+            other = f_rational_new_bang1(CLASS_OF(self), other);
+        }
+        return rb_assoc_new(other, self);
     }
 
     rb_raise(rb_eTypeError, "%s can't be coerced into %s",
@@ -2060,7 +2067,6 @@ integer_denominator(VALUE self) https://github.com/ruby/ruby/blob/trunk/rational.c#L2067
     return INT2FIX(1);
 }
 
-static VALUE float_to_r(VALUE self);
 /*
  * call-seq:
  *    flo.numerator  ->  integer
-- 
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