https://git.ruby-lang.org/ruby.git/commit/?id=771f6dd75d

From 771f6dd75dd38e378e2e0f6de09398b6660b09f2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 8 Jul 2021 16:38:08 +0900
Subject: [ruby/stringio] Suppress a sign-compare warning

https://github.com/ruby/stringio/commit/a88c070e0b
---
 ext/stringio/stringio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 98b9d9a..295650e 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -65,7 +65,7 @@ strio_extract_modeenc(VALUE *vmode_p, VALUE *vperm_p, VALUE opthash, https://github.com/ruby/ruby/blob/trunk/ext/stringio/stringio.c#L65
 		n = strchr(n, '|');
 	    }
 	    e = strchr(++n, ':');
-	    len = e ? e - n : strlen(n);
+	    len = e ? e - n : (long)strlen(n);
 	    if (len > 0 && len <= ENCODING_MAXNAMELEN) {
 		if (e) {
 		    memcpy(encname, n, len);
-- 
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