Go 1.19 is not yet released. These are work-in-progress release notes. Go 1.19 is expected to be released in August 2022.
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unix build constraint
The build constraint unix is now recognized
in //go:build lines. The constraint is satisfied
if the target operating system, also known as GOOS, is
a Unix or Unix-like system. For the 1.19 release it is satisfied
if GOOS is one of
aix, android, darwin,
dragonfly, freebsd, hurd,
illumos, ios, linux,
netbsd, openbsd, or solaris.
In future releases the unix constraint may match
additional newly supported operating systems.
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As always, there are various minor changes and updates to the library, made with the Go 1 promise of compatibility in mind.
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The pure Go resolver will now use EDNS(0) to include a suggested
maximum reply packet length, permitting reply packets to contain
up to 1232 bytes (the previous maximum was 512).
In the unlikely event that this causes problems with a local DNS
resolver, setting the environment variable
GODEBUG=netdns=cgo to use the cgo-based resolver
should work.
Please report any such problems on the
issue tracker.