https://git.ruby-lang.org/ruby.git/commit/?id=a60dfff434

From a60dfff43470583bbb4474594efde8607f889e8b Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Fri, 11 Sep 2020 13:15:08 -0700
Subject: [ruby/zlib] Document that gets can return nil when eof? returns false

This behavior differs from File#gets.

Fixes [Bug #13904]

https://github.com/ruby/zlib/commit/448e41efdd

diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index c8b206f..c540d4c 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -4229,6 +4229,8 @@ gzreader_gets(int argc, VALUE *argv, VALUE obj) https://github.com/ruby/ruby/blob/trunk/ext/zlib/zlib.c#L4229
  * Document-method: Zlib::GzipReader#gets
  *
  * See Zlib::GzipReader documentation for a description.
+ * However, note that this method can return +nil+ even if
+ * #eof? returns false, unlike the behavior of File#gets.
  */
 static VALUE
 rb_gzreader_gets(int argc, VALUE *argv, VALUE obj)
-- 
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