From c579349c05ba7e7fa1c8936cf94647e5771eed58 Mon Sep 17 00:00:00 2001
From: Laurence Withers <l@lwithers.me.uk>
Date: Sun, 18 Feb 2024 14:31:13 +0000
Subject: [PATCH] Pre-size net.Buffers

This leads to a further reduction in allocations per call. Before:
	goos: linux
	goarch: amd64
	pkg: src.lwithers.me.uk/go/journal
	cpu: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
	BenchmarkEntry-8   	12611158	    1445 ns/op	   221 B/op	     7 allocs/op
	PASS
	ok  	src.lwithers.me.uk/go/journal	19.673s

After:
	goos: linux
	goarch: amd64
	pkg: src.lwithers.me.uk/go/journal
	cpu: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
	BenchmarkEntry-8   	13613377	     1329 ns/op	    149 B/op	      5 allocs/op
	PASS
	ok  	src.lwithers.me.uk/go/journal	19.435s
---
 wire_proto.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/wire_proto.go b/wire_proto.go
index 7f1b41c..4f8d3ea 100644
--- a/wire_proto.go
+++ b/wire_proto.go
@@ -4,6 +4,7 @@ import (
 	"encoding/binary"
 	"io"
 	"net"
+	"slices"
 )
 
 var (
@@ -19,6 +20,7 @@ var (
 // atomic, and this function is safe to use across goroutines. Otherwise,
 // writes may be interleaved.
 func WireWrite(buf *net.Buffers, w io.Writer, attrs []Attr) error {
+	*buf = slices.Grow(*buf, len(*buf)+len(attrs)*4)
 	for i := range attrs {
 		key := attrs[i].Key.key
 		if key == "" {