Refactor to improve states

*   Remove custom kind wrappers, use plain bytes instead
*   Remove `Into`s, use the explicit expected types instead
*   Refactor to use `slice.as_str` in most places
*   Remove unneeded unique check before adding a definition
*   Use a shared CDATA prefix in constants
*   Inline byte checks into matches
*   Pass bytes back from parser instead of whole parse state
*   Refactor to work more often on bytes
*   Rename custom `size` to `len`

1 files changed, 3 insertions, 4 deletions

diff --git a/src/content/document.rs b/src/content/document.rs
index 828431d..76d510a 100644
--- a/src/content/document.rs
+++ b/src/content/document.rs
@@ -89,14 +89,13 @@ pub fn document(parse_state: &mut ParseState, point: Point) -> Vec<Event> {
         let event = &tokenizer.events[index];
 
         if event.event_type == EventType::Exit && event.token_type == Token::DefinitionLabelString {
-            // To do: when we operate on u8, we can use a `to_str` here as we
-            // don‘t need virtual spaces.
+            // Note: we don‘t care about virtual spaces, so `as_str` is fine.
             let id = normalize_identifier(
-                &Slice::from_position(
+                Slice::from_position(
                     tokenizer.parse_state.bytes,
                     &Position::from_exit_event(&tokenizer.events, index),
                 )
-                .serialize(),
+                .as_str(),
             );
 
             if !definitions.contains(&id) {