feat(schema): deny unknown keys (#4270)

src/config.rs

@@ -50,7 +50,11 @@ impl<'a, T: Deserialize<'a> + Default> ModuleConfig<'a, ValueError> for T {
 }
 
 #[derive(Clone, Deserialize, Serialize)]
-#[cfg_attr(feature = "config-schema", derive(schemars::JsonSchema))]
+#[cfg_attr(
+    feature = "config-schema",
+    derive(schemars::JsonSchema),
+    schemars(deny_unknown_fields)
+)]
 #[serde(untagged)]
 pub enum Either<A, B> {
     First(A),