https://git.ruby-lang.org/ruby.git/commit/?id=4814528296

From 48145282969230ba4a7c8cc7a6aedfd1263900c4 Mon Sep 17 00:00:00 2001
From: Akinori MUSHA <knu@i...>
Date: Tue, 17 Aug 2021 21:44:41 +0900
Subject: [DOC] Fix the rdoc for File::Stat#size? [ci skip]

---
 file.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/file.c b/file.c
index 4ea8de6..41ebf86 100644
--- a/file.c
+++ b/file.c
@@ -6063,11 +6063,13 @@ rb_stat_z(VALUE obj) https://github.com/ruby/ruby/blob/trunk/file.c#L6063
 
 /*
  *  call-seq:
- *     state.size    -> integer
+ *     stat.size?    -> Integer or nil
  *
- *  Returns the size of <i>stat</i> in bytes.
+ *  Returns +nil+ if <i>stat</i> is a zero-length file, the size of
+ *  the file otherwise.
  *
- *     File.stat("testfile").size   #=> 66
+ *     File.stat("testfile").size?   #=> 66
+ *     File.stat("/dev/null").size?  #=> nil
  *
  */
 
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