https://git.ruby-lang.org/ruby.git/commit/?id=548c8f5f7a

From 548c8f5f7aa743ae05610ed372f857a6b488e89c Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Sat, 25 Dec 2021 02:26:06 +1300
Subject: Prefer to use RTEST when checking result of `rb_io_wait`. (#5341)

* Prefer to use RTEST when checking result of `rb_io_wait`.

* Consistently use false for signifying no events ready.
---
 ext/io/console/console.c | 2 +-
 io.c                     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index 5dec1a4c068..4c5f89f80df 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -556,7 +556,7 @@ console_getch(int argc, VALUE *argv, VALUE io) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L556
 	    if (!(w & RB_WAITFD_IN)) return Qnil;
 # else
 	    VALUE result = rb_io_wait(io, RUBY_IO_READABLE, timeout);
-	    if (result == Qfalse) return Qnil;
+	    if (!RTEST(result)) return Qnil;
 # endif
 	}
 	else if (optp->vtime) {
diff --git a/io.c b/io.c
index f104ff53710..4ed4ee34f84 100644
--- a/io.c
+++ b/io.c
@@ -1483,7 +1483,7 @@ rb_io_maybe_wait(int error, VALUE io, VALUE events, VALUE timeout) https://github.com/ruby/ruby/blob/trunk/io.c#L1483
 
       default:
         // Non-specific error, no event is ready:
-        return RB_INT2NUM(0);
+        return Qfalse;
     }
 }
 
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