The highest tagged major version is v1.

docker/

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Valid go.mod file

The Go module system was introduced in Go 1.11 and is the official dependency management solution for Go.
Redistributable license

Redistributable licenses place minimal restrictions on how software can be used, modified, and redistributed.
Tagged version

Modules with tagged versions give importers more predictable builds.
Stable version

When a project reaches major version v1 it is considered stable.
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Path	Synopsis
api
client
server
dockerversion
engine
opts
pkg
ioutils
log
mflag Package flag implements command-line flag parsing.	Package flag implements command-line flag parsing.
mflag/example
parsers
parsers/filters
parsers/kernel
parsers/operatingsystem
term
units
version
utils