Add CHANGELOG entry and update README

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add minimal support for `#[serde(flatten)]` with roundtripping through RON maps ([#455](https://github.com/ron-rs/ron/pull/455))
 - Breaking: Bump `bitflags` dependency to 2.0, changes `serde` impls of `Extensions` ([#443](https://github.com/ron-rs/ron/pull/443))
 - Bump MSRV to 1.64.0 and bump dependency: `indexmap` to 2.0 ([#459](https://github.com/ron-rs/ron/pull/459))
+- Add minimal roundtripping support for `#[serde(tag = "tag")]`, `#[serde(tag = "tag", content = "content")]`, and `#[serde(untagged)]` enums ([#451](https://github.com/ron-rs/ron/pull/451))
 
 ## [0.8.0] - 2022-08-17
 

README.md

@@ -104,13 +104,17 @@ Note the following advantages of RON over JSON:
 
 ## Limitations
 
-RON is not designed to be a fully self-describing format (unlike JSON) and is thus not guaranteed to work when [`deserialize_any`](https://docs.rs/serde/latest/serde/trait.Deserializer.html#tymethod.deserialize_any) is used instead of its typed alternatives. In particular, the following Serde attributes are not yet supported:
-- `#[serde(tag = "type")]`, i.e. internally tagged enums
-- `#[serde(untagged)]`, i.e. untagged enums
+RON is not designed to be a fully self-describing format (unlike JSON) and is thus not guaranteed to work when [`deserialize_any`](https://docs.rs/serde/latest/serde/trait.Deserializer.html#tymethod.deserialize_any) is used instead of its typed alternatives. In particular, the following Serde attributes only have limited support:
 
-Furthermore, `#[serde(flatten)]` only has limited support and relies on a small hack [^serde-flatten-hack]. Specifically, flattened structs are only serialised as maps and deserialised from maps. However, this limited implementation supports full roundtripping.
+- `#[serde(tag = "tag")]`, i.e. internally tagged enums [^serde-enum-hack]
+- `#[serde(tag = "tag", content = "content")]`, i.e. adjacently tagged enums [^serde-enum-hack]
+- `#[serde(untagged)]`, i.e. untagged enums [^serde-enum-hack]
+- `#[serde(flatten)]`, i.e. flattening of structs into maps [^serde-flatten-hack]
 
-[^serde-flatten-hack]: Deserialising a flattened struct from a map requires that the struct's [`Visitor::expecting`](https://docs.rs/serde/latest/serde/de/trait.Visitor.html#tymethod.expecting) implementation formats a string starting with `"struct "`. This is the case for automatically-derived [`Deserialize`](https://docs.rs/serde/latest/serde/de/trait.Deserialize.html) impls on structs.
+While data structures with any of these attributes should roundtrip through RON, their textual representation may not always match your expectation. For instance, flattened structs are only serialised as maps and deserialised from maps.
+
+[^serde-enum-hack]: Deserialising an internally, adjacently, or un-tagged enum requires detecting `serde`'s internal `serde::__private::de::content::Content` content type so that RON can describe the deserialised data structure in serde's internal JSON-like format. This detection only works for the automatically-derived [`Deserialize`](https://docs.rs/serde/latest/serde/de/trait.Deserialize.html) impls on enums. See https://github.com/ron-rs/ron/pull/451 for more details.
+[^serde-flatten-hack]: Deserialising a flattened struct from a map requires that the struct's [`Visitor::expecting`](https://docs.rs/serde/latest/serde/de/trait.Visitor.html#tymethod.expecting) implementation formats a string starting with `"struct "`. This is the case for automatically-derived [`Deserialize`](https://docs.rs/serde/latest/serde/de/trait.Deserialize.html) impls on structs. See https://github.com/ron-rs/ron/pull/455 for more details.
 
 ## RON syntax overview