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+ The PR title is formatted as follows: `net/http: frob the quux before blarfing`
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pkg bufio, method (*Writer) AvailableBuffer() []uint8
pkg bufio, method (ReadWriter) AvailableBuffer() []uint8
pkg bytes, func Cut([]uint8, []uint8) ([]uint8, []uint8, bool)
pkg bytes, func Title //deprecated
pkg crypto/tls, method (*Conn) NetConn() net.Conn
pkg crypto/tls, type Config struct, PreferServerCipherSuites //deprecated
pkg crypto/x509, method (*CertPool) Subjects //deprecated
pkg debug/buildinfo, func Read(io.ReaderAt) (*debug.BuildInfo, error)

---
title: "Go, Backwards Compatibility, and GODEBUG"
layout: article
---

<!--
This document is kept in the Go repo, not x/website,
because it documents the full list of known GODEBUG settings,
which are tied to a specific release.
-->

## Introduction {#intro}

Go's emphasis on backwards compatibility is one of its key strengths.
There are, however, times when we cannot maintain complete compatibility.

pkg bytes, func SplitAfter([]uint8, []uint8) [][]uint8
pkg bytes, func SplitAfterN([]uint8, []uint8, int) [][]uint8
pkg bytes, func SplitN([]uint8, []uint8, int) [][]uint8
pkg bytes, func Title([]uint8) []uint8
pkg bytes, func ToLower([]uint8) []uint8
pkg bytes, func ToLowerSpecial(unicode.SpecialCase, []uint8) []uint8
pkg bytes, func ToTitle([]uint8) []uint8