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Go go1.21rc4

Go: go1.21rc4 Release

Release date:
August 2, 2023
Previous version:
go1.21rc3 (released July 14, 2023)
Magnitude:
7,172 Diff Delta
Contributors:
37 total committers
Data confidence:
Commits:
95 impacting commits

39 Features Released with go1.21rc4

doc: write release notes for Go 1.21
#58645
cmd/dist: add json output support
#37486
spec: update to latest version before releasing Go 1.21
#61659
cmp: new package with Ordered, Compare, Less; min, max as builtins
#59488
reflect: add TypeFor
#60088
runtime: time.Sleep takes more time than expected on Windows (1ms -> 10ms)
#44343
x/build/cmd/relui: ensure fully reproducible builds, including tar.gz/zip archives
#24904
cmd/compile: ranging exclusively values over slices and arrays that are not cheaply indexable keeps alive 3 registers instead of 2
#61629
cmd/asm: doesn't support PCALIGN on i386/amd64
#56474
cmd/compile: regression: unnecessary spilling to the stack
#61356
debug/elf: improve File.Symbols() by not using reflection
#61534
maps: remove Keys and Values for Go 1.21
#61538
cmd/compile, cmd/link: c-shared not supported on linux/loong64
#53301
sort: slices.Sort is slightly slower than sort.Strings on some sorted inputs
#60777
cmd/link: Go c-archive doesn't work with new Xcode 15 beta ld-prime linker
#60694
crypto/tls: verifying certificate chains containing large RSA keys is slow [CVE-2023-29409]
#61460
archive/zip: add (*Writer).AddFS
#54898
cmd/link: issues with Apple's new linker in Xcode 15
#61229
cmd/go: go.env modifications during bootstrap makes tests fail
#61358
all: end support for Windows 8, Windows Server 2012 in Go 1.21 or 1.22
#57004
debug/buildinfo: module info not read when buildinfo section length exceeds 64KB
#61644
slog/log: Concurrent writes to TextHandler and JSONHandler lose log lines.
#61321
cmd/link: fingerprint mismatch: after adding default.pgo
#61376
regexp/syntax: accept (?<name>...) in addition to (?P<name>...)
#58458
sync: using a nil Pool causes a fatal error
#61651
crypto/internal/nistec: p256_asm_s390x.s causes SIGFPE: floating-point exception on older s390
#58465
cmd/compile: failed to make Go on riscv64 CPU with numa [1.19 backport]
#61470
cmd/compile: internal compiler error: panic: builtins.go: assertion failed [1.21 backport]
#61492
go/types: uncommon pointer sizes result in an assertion failure
#61249
bytes: `Test killed with quit` on `wasip1-wasm-wazero`
#61071

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Top Contributors in go1.21rc4

griesemer
dmitshur
mdempsky
randall77
4a6f656c
ianlancetaylor
Jorropo
cherrymui
bcmills
korniltsev

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