Serialization of Option<String> = None, old behaviour still possible?

[ghost]

According to #252 (fixed by #490), None values for attributes that are Option<String> now serialize to Some(""), whereas the old behaviour was to not serialize at all. I have several XML specs where the attribute must have a value if present or not be present at all. Is this no longer possible?

In my case I get lots of optional_attr="" that no longer validate and create an excessive amount of (useless) data. Do I have to write my own serialization for this from now on?

I have ensured the attributes really do deserialize to None, before serializing back.

Sorry I guess there's always that someone who needs the opposite...

I'm using:

serde = { version = "1.0.152", features = [ "derive" ] }
quick-xml = { version = "0.27.1", features = [ "serialize" ] }

[Mingun]

According to #252 (fixed by #490), None values for attributes that are Option<String> now serialize to Some("")

You mean, that Option<String>::None is serialized as some_attribute="". Yes, this is now the behaviour by default, which mathes the behaviour of serde_json and serde_yaml. To not write empty attributes annotate your fields with #[serde(skip_serializing_if = "Option::is_none")] as written in the serde examples.