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dumpNull example

    public static function dump(mixed $value, int $flags = 0): string
    {
        switch (true) {
            case \is_resource($value):
                if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) {
                    throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value)));
                }

                return self::dumpNull($flags);
            case $value instanceof \DateTimeInterface:
                return $value->format(match (true) {
                    !$length = \strlen(rtrim($value->format('u'), '0')) => 'c',
                    $length < 4 => 'Y-m-d\TH:i:s.vP',
                    default => 'Y-m-d\TH:i:s.uP',
                });
            case $value instanceof \UnitEnum:
                return sprintf('!php/const %s::%s', $value::class, $value->name);
            case \is_object($value):
                if ($value instanceof TaggedValue) {
                    return '!'.$value->getTag().' '.self::dump($value->getValue(), $flags);
                }