Set DISALLOW_INSTANTIATION flag on several types according to cpython impl

Signed-off-by: snowapril <sinjihng@gmail.com>

Author: Snowapril

crates/stdlib/src/array.rs

@@ -1399,7 +1399,7 @@ mod array {
         internal: PyMutex<PositionIterInternal<PyArrayRef>>,
     }
 
-    #[pyclass(with(IterNext, Iterable), flags(HAS_DICT))]
+    #[pyclass(with(IterNext, Iterable), flags(HAS_DICT, DISALLOW_INSTANTIATION))]
     impl PyArrayIter {
         #[pymethod]
         fn __setstate__(&self, state: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {

crates/stdlib/src/csv.rs

@@ -908,7 +908,7 @@ mod _csv {
         }
     }
 
-    #[pyclass(with(IterNext, Iterable))]
+    #[pyclass(with(IterNext, Iterable), flags(DISALLOW_INSTANTIATION))]
     impl Reader {
         #[pygetset]
         fn line_num(&self) -> u64 {
@@ -1059,7 +1059,7 @@ mod _csv {
         }
     }
 
-    #[pyclass]
+    #[pyclass(flags(DISALLOW_INSTANTIATION))]
     impl Writer {
         #[pygetset(name = "dialect")]
         const fn get_dialect(&self, _vm: &VirtualMachine) -> PyDialect {

crates/stdlib/src/pystruct.rs

@@ -189,7 +189,7 @@ pub(crate) mod _struct {
         }
     }
 
-    #[pyclass(with(Unconstructible, IterNext, Iterable))]
+    #[pyclass(with(IterNext, Iterable), flags(DISALLOW_INSTANTIATION))]
     impl UnpackIterator {
         #[pymethod]
         fn __length_hint__(&self) -> usize {

crates/stdlib/src/unicodedata.rs

@@ -105,7 +105,7 @@ mod unicodedata {
         }
     }
 
-    #[pyclass]
+    #[pyclass(flags(DISALLOW_INSTANTIATION))]
     impl Ucd {
         #[pymethod]
         fn category(&self, character: PyStrRef, vm: &VirtualMachine) -> PyResult<String> {

crates/stdlib/src/zlib.rs

@@ -225,7 +225,7 @@ mod zlib {
         inner: PyMutex<PyDecompressInner>,
     }
 
-    #[pyclass]
+    #[pyclass(flags(DISALLOW_INSTANTIATION))]
     impl PyDecompress {
         #[pygetset]
         fn eof(&self) -> bool {
@@ -383,7 +383,7 @@ mod zlib {
         inner: PyMutex<CompressState<CompressInner>>,
     }
 
-    #[pyclass]
+    #[pyclass(flags(DISALLOW_INSTANTIATION))]
     impl PyCompress {
         #[pymethod]
         fn compress(&self, data: ArgBytesLike, vm: &VirtualMachine) -> PyResult<Vec<u8>> {