Add an Value::is_integer method (#580)

CHANGELOG.md

@@ -14,6 +14,8 @@ All notable changes to MiniJinja are documented here.
   values.  #571
 - Changed sort order of `Ord` to avoid accidentally non total order
   that could cause panics on Rust 1.81.  #579
+- Added a `Value::is_integer` method to allow a user to tell floats
+  and true integers apart.  #580
 
 ## 2.2.0
 

minijinja/src/tests.rs

@@ -307,13 +307,7 @@ mod builtins {
     /// ```
     #[cfg_attr(docsrs, doc(cfg(feature = "builtins")))]
     pub fn is_integer(v: Value) -> bool {
-        matches!(
-            v.0,
-            crate::value::ValueRepr::U64(_)
-                | crate::value::ValueRepr::I64(_)
-                | crate::value::ValueRepr::U128(_)
-                | crate::value::ValueRepr::I128(_)
-        )
+        v.is_integer()
     }
 
     /// Checks if this value is a float

minijinja/src/value/mod.rs

@@ -979,6 +979,17 @@ impl Value {
         )
     }
 
+    /// Returns true if the number is a real integer.
+    ///
+    /// This can be used to distinguish `42` from `42.0`.  For the most part
+    /// the engine keeps these the same.
+    pub fn is_integer(&self) -> bool {
+        matches!(
+            self.0,
+            ValueRepr::U64(_) | ValueRepr::I64(_) | ValueRepr::I128(_) | ValueRepr::U128(_)
+        )
+    }
+
     /// Returns `true` if the map represents keyword arguments.
     pub fn is_kwargs(&self) -> bool {
         Kwargs::extract(self).is_some()