The highest tagged major version is v4.

builder/

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Valid go.mod file

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Redistributable license

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Tagged version

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

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Path	Synopsis
command This package contains the set of Dockerfile commands.	This package contains the set of Dockerfile commands.
parser This package implements a parser and parse tree dumper for Dockerfiles.	This package implements a parser and parse tree dumper for Dockerfiles.
dumper