From be01529d44b3dd2eb8fdf0162563cdc0a196c0ca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20Mur=C3=A9?= <batolettre@gmail.com>
Date: Tue, 22 Jul 2025 12:27:57 +0200
Subject: [PATCH] perf: pre-allocate the buffer when encoding a varsig

---
 varsig.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/varsig.go b/varsig.go
index 3cdfe6a..513d10d 100644
--- a/varsig.go
+++ b/varsig.go
@@ -89,7 +89,10 @@ func (v varsig) Signature() []byte {
 }
 
 func (v varsig) encode() []byte {
-	var buf []byte
+	// Pre-allocate to the maximum size to avoid re-allocating.
+	// I think the maximum is 10 bytes, but it's all the same for go to allocate 16 (due to the small
+	// size allocation class), so we might as well get some headroom for bigger varints.
+	buf := make([]byte, 0, 16)
 
 	buf = binary.AppendUvarint(buf, Prefix)