refactor(edit): Bypass a layer of abstraction in ser

Author: epage

crates/toml_edit/src/ser/map.rs

@@ -573,14 +573,14 @@ impl serde::ser::Serializer for &mut MapValueSerializer {
 
 pub struct SerializeStructVariant {
  variant: &'static str,
- inner: SerializeMap,
+ inner: SerializeInlineTable,
 }
 
 impl SerializeStructVariant {
  pub(crate) fn struct_(variant: &'static str, len: usize) -> Self {
  Self {
  variant,
- inner: SerializeMap::table_with_capacity(len),
+ inner: SerializeInlineTable::with_capacity(len),
  }
  }
 }
@@ -599,7 +599,7 @@ impl serde::ser::SerializeStructVariant for SerializeStructVariant {
 
  #[inline]
  fn end(self) -> Result<Self::Ok, Self::Error> {
- let inner = serde::ser::SerializeStruct::end(self.inner)?;
+ let inner = serde::ser::SerializeStruct::end(self.inner)?.into();
  let mut items = crate::table::KeyValuePairs::new();
  let value = crate::Item::Value(inner);
  items.insert(crate::Key::new(self.variant), value);