https://git.ruby-lang.org/ruby.git/commit/?id=37259e878f

From 37259e878f05db4106b67a9fc9cdc426d174282c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 10 Oct 2020 21:58:07 +0900
Subject: [ruby/io-console] Relaxed min: option warning

When `min: 0` is given to `IO#getch` with `time:` option, it is
expected to return nil if timed out, and needed for source code
the compatibility with unixen platforms.

https://github.com/ruby/io-console/commit/a2afbe72bd

diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index 11ce699..7d5181c 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -537,7 +537,13 @@ console_getch(int argc, VALUE *argv, VALUE io) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L537
 	    timeout = rb_scheduler_timeout(&tv);
 # endif
 	}
-	if (optp->vmin != 1) {
+	switch (optp->vmin) {
+	  case 1: /* default */
+	    break;
+	  case 0: /* return nil when timed out */
+	    if (optp->vtime) break;
+	    /* fallthru */
+	  default:
 	    rb_warning("min option ignored");
 	}
 	if (optp->intr) {
-- 
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