DRAFT RELEASE NOTES - Introduction to Go 1.13

Go 1.13 is not yet released. These are work-in-progress release notes. Go 1.13 is expected to be released in August 2019.

As of Go 1.13, the go command downloads and authenticates modules using the Go module mirror and Go checksum database run by Google. See https://proxy.golang.org/privacy for privacy information about these services and the go command documentation for configuration details.

TODO

Changes to the language

TODO

Ports

TODO

Darwin

As announced in the Go 1.12 release notes, Go 1.13 now requires macOS 10.11 El Capitan or later; support for previous versions has been discontinued.

FreeBSD

As announced in the Go 1.12 release notes, Go 1.13 now requires FreeBSD 11.2 or later; support for previous versions has been discontinued. FreeBSD 12.0 or later requires a kernel with the COMPAT_FREEBSD11 option set (this is the default).

Tools

TODO

Runtime

TODO

Core library

TODO generally

TLS 1.3

TODO; link to Go 1.12 notes.

Minor changes to the library

As always, there are various minor changes and updates to the library, made with the Go 1 promise of compatibility in mind.

TODO

all

TODO: https://golang.org/cl/174457: add new GOOS=illumos, split out of GOOS=solaris

bytes

TODO: https://golang.org/cl/161760: hoist error creation out of function

context

TODO: https://golang.org/cl/169080: don't depend on fmt

crypto/ed25519

TODO: https://golang.org/cl/174945: promote from golang.org/x/crypto/ed25519

crypto/tls

TODO: https://golang.org/cl/177698: add support for Ed25519 certificates in TLS 1.2 and 1.3

database/sql

TODO: https://golang.org/cl/170699: add NullTime

TODO: https://golang.org/cl/174178: add NullInt32

debug/dwarf

TODO: https://golang.org/cl/158797: more graceful handling of unsupported types

html/template

TODO: https://golang.org/cl/175218: add support for JavaScript modules

log

TODO: https://golang.org/cl/168920: expose Writer() method of the standard logger

math/big

TODO: https://golang.org/cl/160682: implement Rat.SetUint64

TODO: https://golang.org/cl/168237: accept non-decimal floats with Rat.SetString

math/bits

TODO: https://golang.org/cl/178177: document that Add, Sub, Mul, RotateLeft, ReverseBytes are constant time

net

TODO: https://golang.org/cl/156366: use DNS over TCP when use-vc is set in resolv.conf

TODO: https://golang.org/cl/166297: use libSystem bindings for DNS resolution on macos if cgo is unavailable

TODO: https://golang.org/cl/170678: add KeepAlive field to ListenConfig

net/http

The new field Transport.ForceAttemptHTTP2 controls whether HTTP/2 is enabled when a non-zero Dial, DialTLS, or DialContext func or TLSClientConfig is provided.

When reusing HTTP/2, the Transport no longer performs unnecessary TLS handshakes.

TimeoutHandler's ResponseWriter now implements the Pusher and Flusher interfaces.

The new Server fields BaseContext and ConnContext allow finer control over the Context values provided to requests and connections.

The new Header method Clone returns a copy of the receiver.

os

If a File is opened using the O_APPEND flag, its WriteAt method will always return an error.

os/exec

On Windows, the environment for a Cmd always inherits the %SYSTEMROOT% value of the parent process unless the Cmd.Env field includes an explicit value for it.

reflect

TODO: https://golang.org/cl/171337: add Value.IsZero

TODO: https://golang.org/cl/174531: MakeFunc: allow assignment conversions on values returned from the wrapped function

runtime

TODO: https://golang.org/cl/170318: randomize package initialization order in race mode

runtime, internal/poll, net

TODO: https://golang.org/cl/166497: report event scanning error on read event

runtime/cgo

TODO: https://golang.org/cl/170127: look for android_get_device_api_level in libc.so

strings, bytes

TODO: https://golang.org/cl/142003: add ToValidUTF8

sync

TODO: https://golang.org/cl/166960: use lock-free structure for Pool stealing

TODO: https://golang.org/cl/166961: smooth out Pool behavior over GC with a victim cache

syscall

TODO: https://golang.org/cl/168479: avoid _getdirentries64 on darwin

TODO: https://golang.org/cl/174197: allow setting security attributes on processes

TODO: https://golang.org/cl/174320: don't return EINVAL on zero Chmod mode on Windows

syscall/js

TODO: https://golang.org/cl/177537: replace TypedArrayOf with CopyBytesToGo/CopyBytesToJS

testing

TODO: https://golang.org/cl/112155: stop rounding b.N

TODO: https://golang.org/cl/166717: add B.ReportMetric for custom benchmark metrics

TODO: https://golang.org/cl/173722: delay flag registration; move to an Init function

text/scanner

TODO: https://golang.org/cl/163079: don't liberally consume (invalid) floats or underbars

text/template

TODO: https://golang.org/cl/161762: add a slice function to the predefined global functions

time

TODO: https://golang.org/cl/122876: add support for day-of-year in Format and Parse

TODO: https://golang.org/cl/167387: add methods to convert duration to microseconds and milliseconds