Add Value::as_list(), as_list_mut(), and is_list()

- Use "list" instead of "array" in method names which is the terminology
  in the spec.
- as_array(), as_array_mut(), and is_array() are treated as alternative
  method names. While they could be deprecated, there is no harm is
  keeping them. It is extremely unlikely that the spec will change to
  add an array vs list encoding.

Author: bluk

src/value.rs

@@ -174,24 +174,42 @@ impl Value {
         }
     }
 
-    /// If the value is an array, returns a reference to the underlying value.
+    /// If the value is a list, returns a reference to the underlying value.
     #[must_use]
-    pub fn as_array(&self) -> Option<&Vec<Value>> {
+    pub fn as_list(&self) -> Option<&Vec<Value>> {
         match self {
             Value::List(ref l) => Some(l),
             _ => None,
         }
     }
 
-    /// If the value is an array, returns a mutable reference to the underlying value.
+    /// If the value is a list, returns a mutable reference to the underlying value.
     #[must_use]
-    pub fn as_array_mut(&mut self) -> Option<&mut Vec<Value>> {
+    pub fn as_list_mut(&mut self) -> Option<&mut Vec<Value>> {
         match self {
             Value::List(ref mut l) => Some(l),
             _ => None,
         }
     }
 
+    /// If the value is a list, returns a reference to the underlying value.
+    ///
+    /// Alternative method name for [Value::as_list()].
+    #[inline]
+    #[must_use]
+    pub fn as_array(&self) -> Option<&Vec<Value>> {
+        self.as_list()
+    }
+
+    /// If the value is a list, returns a mutable reference to the underlying value.
+    ///
+    /// Alternative method name for [Value::as_list_mut()].
+    #[inline]
+    #[must_use]
+    pub fn as_array_mut(&mut self) -> Option<&mut Vec<Value>> {
+        self.as_list_mut()
+    }
+
     /// If the value is a dictionary, returns a reference to the underlying value.
     #[must_use]
     pub fn as_dict(&self) -> Option<&BTreeMap<ByteString, Value>> {
@@ -240,10 +258,18 @@ impl Value {
         self.as_i64().is_some()
     }
 
-    /// Returns true if the value is an array.
+    /// Returns true if the value is a list.
+    #[must_use]
+    pub fn is_list(&self) -> bool {
+        self.as_list().is_some()
+    }
+
+    /// Returns true if the value is a list.
+    ///
+    /// Alternative method name for [Value::is_list()].
     #[must_use]
     pub fn is_array(&self) -> bool {
-        self.as_array().is_some()
+        self.is_list()
     }
 
     /// Returns true if the value is a dictionary.