filter recognition does not work
…o the halt handler. This is needed if you want to support partial parsing of the command line, e.g. command --foo --bar=bar subcommand --subcommandfoo footoo --subcommandbar bar where the command supports several "subcommands" each ith separate options. here, if you halt the processing when you receive subcommand, the halt callback will contain the array [ '--subcommandfoo', 'footoo', '--subcommandbar', 'bar' ] which can be piped into a new instance of optparse.