https://git.ruby-lang.org/ruby.git/commit/?id=347c3faf8e

From 347c3faf8eba55cdb09861c29f8646d78053fa5c Mon Sep 17 00:00:00 2001
From: Mau Magnaguagno <maumagnaguagno@g...>
Date: Mon, 28 Feb 2022 22:05:49 -0300
Subject: [DOC] Fix String#getbyte doc

* String#getbyte returns `nil` if `index` is out of range.

* Add String#getbyte example with nil output.

* Modify String#getbyte example to use negative index.
---
 string.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/string.c b/string.c
index 4b35b076e0..55cdace9f8 100644
--- a/string.c
+++ b/string.c
@@ -6070,13 +6070,14 @@ rb_str_chr(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6070
 
 /*
  *  call-seq:
- *    getbyte(index) -> integer
+ *    getbyte(index) -> integer or nil
  *
- *  Returns the byte at zero-based +index+ as an integer:
+ *  Returns the byte at zero-based +index+ as an integer, or +nil+ if +index+ is out of range:
  *
- *    s = 'abcde'  # => "abcde"
- *    s.getbyte(0) # => 97
- *    s.getbyte(1) # => 98
+ *    s = 'abcde'   # => "abcde"
+ *    s.getbyte(0)  # => 97
+ *    s.getbyte(-1) # => 101
+ *    s.getbyte(5)  # => nil
  *
  *  Related: String#setbyte.
  */
-- 
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