Full returns the Long version + all the run time BuildInfo, ie all the dependent modules and version and hash as well.

Long returns the long fortio version and build information.

Short returns the 3 digit short fortio version string Major.Minor.Patch it matches the project git tag (without the leading v) or "dev" when not built from tag / not `go install fortio.org/fortio@latest` version.Short() is the overall project version (used to version json output too).