core: Fix __inv__ for i8-based boolean operands

nac3core/src/codegen/expr.rs

@@ -1308,7 +1308,14 @@ pub fn gen_unaryop_expr_with_values<'ctx, G: CodeGenerator>(
         let val = val.into_int_value();
         match op {
             ast::Unaryop::Invert | ast::Unaryop::Not => {
-                ctx.builder.build_not(val, "not").map(Into::into).unwrap()
+                let not = ctx.builder.build_not(val, "not").unwrap();
+                let not_bool = ctx.builder.build_and(
+                    not,
+                    not.get_type().const_int(1, false),
+                    "",
+                ).unwrap();
+
+                not_bool.into()
             }
             _ => val.into(),
         }

nac3standalone/demo/src/ndarray.py

@@ -455,6 +455,12 @@ def test_ndarray_inv():
     output_ndarray_int32_2(x_int32)
     output_ndarray_int32_2(y_int32)
 
+    x_bool = np_full([2, 2], True)
+    y_bool = ~x_bool
+
+    output_ndarray_bool_2(x_bool)
+    output_ndarray_bool_2(y_bool)
+
 def test_ndarray_eq():
     x = np_identity(2)
     y = x == np_full([2, 2], 0.0)