The highest tagged major version is v3.

internal/

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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

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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
arith Package arith provides performance-sensitive arithmetic operations.	Package arith provides performance-sensitive arithmetic operations.
c Package c provides internal constants.	Package c provides internal constants.