https://git.ruby-lang.org/ruby.git/commit/?id=05a3dc1a65

From 05a3dc1a654c5e92200d994d0a51a2e159c88162 Mon Sep 17 00:00:00 2001
From: "S.H" <gamelinks007@g...>
Date: Thu, 18 Nov 2021 13:26:40 +0900
Subject: Improve performance Kernel#Float with using Primitive.mandatory_only?
 method [Feature #18344] (#5133)

---
 kernel.rb | 6 +++++-
 object.c  | 6 ++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/kernel.rb b/kernel.rb
index de20fffcf91..9cc58bc1d96 100644
--- a/kernel.rb
+++ b/kernel.rb
@@ -169,6 +169,10 @@ module Kernel https://github.com/ruby/ruby/blob/trunk/kernel.rb#L169
   #     Float("123.0_badstring", exception: false)  #=> nil
   #
   def Float(arg, exception: true)
-    Primitive.rb_f_float(arg, exception)
+    if Primitive.mandatory_only?
+      Primitive.rb_f_float1(arg)
+    else
+      Primitive.rb_f_float(arg, exception)
+    end
   end
 end
diff --git a/object.c b/object.c
index f98fb839366..755645b76e4 100644
--- a/object.c
+++ b/object.c
@@ -3531,6 +3531,12 @@ rb_Float(VALUE val) https://github.com/ruby/ruby/blob/trunk/object.c#L3531
     return rb_convert_to_float(val, TRUE);
 }
 
+static VALUE
+rb_f_float1(rb_execution_context_t *ec, VALUE obj, VALUE arg)
+{
+    return rb_convert_to_float(arg, TRUE);
+}
+
 static VALUE
 rb_f_float(rb_execution_context_t *ec, VALUE obj, VALUE arg, VALUE opts)
 {
-- 
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