Support passing Any to Python (ends up as None)

lib/Inline/Python.pm6

@@ -97,6 +97,9 @@ sub py_sequence_get_item(OpaquePointer, int)
 sub py_mapping_items(OpaquePointer)
     returns OpaquePointer { ... }
     native(&py_mapping_items);
+sub py_none()
+    returns OpaquePointer { ... }
+    native(&py_none);
 sub py_dec_ref(OpaquePointer)
     { ... }
     native(&py_dec_ref);
@@ -191,6 +194,10 @@ multi method p6_to_py(Hash:D $value) returns OpaquePointer {
     return $dict;
 }
 
+multi method p6_to_py(Any:U $value) returns OpaquePointer {
+    py_none();
+}
+
 method !setup_arguments(@args) {
     my $len = @args.elems;
     my $tuple = py_tuple_new($len);

pyhelper.c

@@ -145,6 +145,11 @@ void py_dict_set_item(PyObject *dict, PyObject *key, PyObject *item) {
     PyDict_SetItem(dict, key, item);
 }
 
+PyObject *py_none() {
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
 void py_dec_ref(PyObject *obj) {
     Py_DECREF(obj);
 }

t/p6_to_py.t

@@ -4,7 +4,7 @@ use v6;
 use Test;
 use Inline::Python;
 
-plan 10;
+plan 11;
 
 my $py = Inline::Python.new();
 $py.run(q[
@@ -14,8 +14,8 @@ def identity(a):
 
 class Foo {
 }
-# , Any, Foo.new
-for ('abcö', Buf.new('äbc'.encode('latin-1')), 24, 2.4.Num, [1, 2], { a => 1, b => 2}) -> $obj {
+# , Foo.new
+for ('abcö', Buf.new('äbc'.encode('latin-1')), 24, 2.4.Num, [1, 2], { a => 1, b => 2}, Any) -> $obj {
     is_deeply $py.call('__main__', 'identity', $obj), $obj, "Can round-trip " ~ $obj.^name;
 }