in src/aws/dynamo.rs [475:487]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
if self.0.is_empty() {
return serializer.serialize_none();
}
let mut map = serializer.serialize_map(Some(self.0.len()))?;
for (k, v) in self.0 {
map.serialize_entry(k, v)?
}
map.end()
}