From a071078e907af99db737799410d713d5ec953eb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Chris=20Hasi=C5=84ski?= <krzysztof.hasinski@gmail.com>
Date: Sun, 11 Jan 2026 03:45:44 +0100
Subject: [PATCH] pack.c: remove wasted allocation in BER integer packing

The 'w' format (BER compressed integer) was allocating an empty
string with rb_str_new(0, 0) then immediately overwriting it with
the correctly-sized allocation. Remove the wasted first allocation.

~50% improvement on BER pack benchmarks.
---
 pack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pack.c b/pack.c
index 87a5c67871..2ef826b0e2 100644
--- a/pack.c
+++ b/pack.c
@@ -736,7 +736,7 @@ pack_pack(rb_execution_context_t *ec, VALUE ary, VALUE fmt, VALUE buffer)
 
           case 'w':		/* BER compressed integer  */
             while (len-- > 0) {
-                VALUE buf = rb_str_new(0, 0);
+                VALUE buf;
                 size_t numbytes;
                 int sign;
                 char *cp;