Plug-ins: numeric defaults stay in their declared range

crates/plugins/src/manifest.rs

@@ -67,11 +67,11 @@ fn int_max() -> i64 {
 }
 
 impl ParamSpec {
-    /// The value a parameter takes when it isn't given.
+    /// The value a parameter takes when it isn't given (numeric defaults clamped into range).
     pub fn default_value(&self) -> Value {
         match self {
-            ParamSpec::Number { default, .. } => json!(default),
-            ParamSpec::Int { default, .. } => json!(default),
+            ParamSpec::Number { min, max, default } => json!(default.clamp(*min, *max)),
+            ParamSpec::Int { min, max, default } => json!((*default).clamp(*min, *max)),
             ParamSpec::Bool { default } => json!(default),
             ParamSpec::Choice { options, default } => json!(default.clone().or_else(|| options.first().cloned()).unwrap_or_default()),
         }
@@ -167,8 +167,8 @@ impl Manifest {
             .params
             .iter()
             .map(|(k, spec)| match spec {
-                ParamSpec::Number { min, max, default } => format!("{k}: {min}..{max} ({default})"),
-                ParamSpec::Int { min, max, default } => format!("{k}: int {min}..{max} ({default})"),
+                ParamSpec::Number { min, max, default } => format!("{k}: {min}..{max} ({})", default.clamp(*min, *max)),
+                ParamSpec::Int { min, max, default } => format!("{k}: int {min}..{max} ({})", (*default).clamp(*min, *max)),
                 ParamSpec::Bool { default } => format!("{k}: bool ({default})"),
                 ParamSpec::Choice { options, .. } => {
                     let opts: Vec<String> = options.iter().map(|o| format!("{o:?}")).collect();
@@ -335,6 +335,26 @@ mod tests {
         }
     }
 
+    #[test]
+    fn numeric_defaults_stay_in_the_declared_range() {
+        let m = Manifest::parse(
+            br#"{"id":"org.example.defaults","name":"Defaults","kind":"filter",
+                "params":{"count":{"type":"int","min":1,"max":10},
+                          "seed":{"type":"int","min":-9007199254740995,"max":-9007199254740993,"default":0},
+                          "amount":{"type":"number","min":0,"max":100,"default":500}}}"#,
+        )
+        .unwrap();
+        let expected = json!({"count": 1, "seed": -9007199254740993_i64, "amount": 100.0});
+        assert_eq!(Value::Object(m.defaults()), expected);
+        assert_eq!(
+            m.params_doc(),
+            "{count: int 1..10 (1), seed: int -9007199254740995..-9007199254740993 (-9007199254740993), amount: 0..100 (100)}"
+        );
+        for given in [Value::Null, json!({}), json!({"count": null, "seed": null, "amount": null})] {
+            assert_eq!(Value::Object(m.resolve_params(&given).unwrap()), expected);
+        }
+    }
+
     #[test]
     fn rejects_bad_manifests() {
         for bad in [

docs/plugins.md

@@ -111,7 +111,8 @@ pointers are offsets into the module's memory.
 - `name`: the menu label (1–64 printable characters). `kind`: `"filter"` (object filter) or `"effect"` (live effect).
 - `params`: in dialog order. Names are `[A-Za-z0-9_]`, not starting with `_`, and not `id`, `ids`, `params` or
   `preview`. The host validates the user's values before calling: missing values take the default, numbers are
-  clamped to `min..max` (ints rounded), a wrong type or an unknown choice is an error.
+  clamped to `min..max` (ints rounded), a wrong type or an unknown choice is an error. Numeric defaults
+  are also clamped to their range, including the implicit zero default of an `int` parameter.
 
 ### Input