golang-github-spf13-pflag-dev 1.0.6~git20210604-d5e0c0615ace-1 (arm64 binary) in ubuntu oracular

 pflag is a drop-in replacement for Go's flag package, implementing
 POSIX/GNU-style --flags
 .
 pflag is compatible with the GNU extensions to
 the POSIX recommendations for command-line options
 (http://www.gnu.org/software/libc/manual/html_node/Argument-Syntax.html).
 .
 Forked from github.com/ogier/pflag.