Impl more readable 'Debug' for 'Value'.

src/value/value.rs

@@ -23,7 +23,7 @@ pub type Dict = Map<String, Value>;
 /// let v = Value::from("hello");
 /// assert_eq!(v.as_str(), Some("hello"));
 /// ```
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 pub enum Value {
     /// A string.
     String(Tag, String),
@@ -421,6 +421,20 @@ impl Value {
     }
 }
 
+impl std::fmt::Debug for Value {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::String(_, v) => f.debug_tuple("String").field(v).finish(),
+            Self::Char(_, v) => f.debug_tuple("Char").field(v).finish(),
+            Self::Bool(_, v) => f.debug_tuple("Bool").field(v).finish(),
+            Self::Num(_, v) => f.debug_tuple("Num").field(v).finish(),
+            Self::Empty(_, v) => f.debug_tuple("Empty").field(v).finish(),
+            Self::Dict(_, v) => f.debug_tuple("Dict").field(v).finish(),
+            Self::Array(_, v) => f.debug_tuple("Array").field(v).finish(),
+        }
+    }
+}
+
 impl PartialEq for Value {
     fn eq(&self, other: &Self) -> bool {
         match (self, other) {