Created the revision stub.

src/document/field.rs

@@ -12,6 +12,7 @@ pub enum Field {
     Duration(Duration),
     Integer(i128),
     None,
+    Revision(Revision),
     StaticString(String),
     Uuid(Uuid),
 }
@@ -116,6 +117,12 @@ impl From<Duration> for Field {
     }
 }
 
+impl From<Revision> for Field {
+    fn from(value: Revision) -> Self {
+        Self::Revision(value)
+    }
+}
+
 impl From<String> for Field {
     fn from(value: String) -> Self {
         Self::StaticString(value)
@@ -350,6 +357,7 @@ pub enum FieldType {
     Duration,
     Integer,
     None,
+    Revision,
     StaticString,
     Uuid,
 }
@@ -362,6 +370,7 @@ impl FieldType {
             FieldType::Duration => Duration::from_secs(0).into(),
             FieldType::Integer => 0.into(),
             FieldType::None => Field::None,
+            FieldType::Revision => Revision::new().into(),
             FieldType::StaticString => "".into(),
             FieldType::Uuid => Uuid::new_v4().into(),
         }
@@ -376,6 +385,7 @@ impl From<&Field> for FieldType {
             Field::Duration(_) => Self::Duration,
             Field::Integer(_) => Self::Integer,
             Field::None => Self::None,
+            Field::Revision(_) => Self::Revision,
             Field::StaticString(_) => Self::StaticString,
             Field::Uuid(_) => Self::Uuid,
         }
@@ -417,3 +427,22 @@ mod fieldtypes {
         }
     }
 }
+
+#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
+struct Revision;
+
+impl Revision {
+    fn new() -> Self {
+        Self {}
+    }
+}
+
+#[cfg(test)]
+mod revisions {
+    use super::*;
+
+    #[test]
+    fn can_create_empty_revision() {
+        let rev = Revision::new();
+    }
+}