Prose\UsingCheckpoint::set PHP Method

    public function set($fieldName, $value)
    {
        // convert $value into something that can appear in our logs
        $convertor = new DataPrinter();
        $printable = $convertor->convertToString($value);
        // what are we doing?
        $log = usingLog()->startAction("set checkpoint field '{$fieldName}' to '{$printable}'");
        // get the checkpoint
        $checkpoint = getCheckpoint();
        // set the value
        $checkpoint->{$fieldName} = $value;
        // all done
        $log->endAction();
    }