Fix PyObject call segmentation fault

src/python.ts

@@ -565,13 +565,25 @@ export class PyObject {
     positional: (PythonConvertible | NamedArgument)[] = [],
     named: Record<string, PythonConvertible> = {},
   ) {
-    const args = py.PyTuple_New(positional.length);
+    // count named arguments
+    const namedCount = positional.filter(
+      (arg) => arg instanceof NamedArgument,
+    ).length;
+
+    const positionalCount = positional.length - namedCount;
+    if (positionalCount < 0) {
+      throw new PythonError("Not enough arguments");
+    }
+
+    const args = py.PyTuple_New(positionalCount);
+
+    let startIndex = 0;
     for (let i = 0; i < positional.length; i++) {
       const arg = positional[i];
       if (arg instanceof NamedArgument) {
         named[arg.name] = arg.value;
       } else {
-        py.PyTuple_SetItem(args, i, PyObject.from(arg).owned.handle);
+        py.PyTuple_SetItem(args, startIndex++, PyObject.from(arg).owned.handle);
       }
     }
     const kwargs = py.PyDict_New();

test/test.ts

@@ -117,11 +117,29 @@ class Person:
   });
 });
 
-Deno.test("named argument", () => {
-  assertEquals(
-    python.str("Hello, {name}!").format(new NamedArgument("name", "world"))
-      .valueOf(),
-    "Hello, world!",
+Deno.test("named argument", async (t) => {
+  await t.step("single named argument", () => {
+    assertEquals(
+      python.str("Hello, {name}!").format(new NamedArgument("name", "world"))
+        .valueOf(),
+      "Hello, world!",
+    );
+  });
+
+  await t.step(
+    "combination of positional parameters and named argument",
+    () => {
+      const { Test } = python.runModule(`
+class Test:
+  def test(self, *args, **kwargs):
+    return all([len(args) == 3, "name" in kwargs])
+`);
+      const t = new Test();
+
+      const d = python.dict({ a: 1, b: 2 });
+      const v = t.test(1, 2, new NamedArgument("name", "vampire"), d);
+      assertEquals(v.valueOf(), true);
+    },
   );
 });