From 73e3654c14e072adb1bcaaded501b2d306081990 Mon Sep 17 00:00:00 2001
From: nicola-bastianello <bastianello@pm.me>
Date: Fri, 4 Sep 2026 15:32:36 +0200
Subject: [PATCH] feat: add __deepcopy__ to Array

---
 decent_array/_array.py |  8 ++++++++
 tests/test_array.py    | 14 ++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/decent_array/_array.py b/decent_array/_array.py
index 5580c4a..81f4f1d 100644
--- a/decent_array/_array.py
+++ b/decent_array/_array.py
@@ -383,6 +383,14 @@ def __str__(self) -> str:
         """Stringify the wrapped value, not the wrapper."""
         return str(self.value)
 
+    # Copy -----------------------------------------------------------------
+
+    def __deepcopy__(self, memo: dict[int, Any]) -> Array:
+        """Deep copy of the array."""
+        copied = self._backend.copy(self)
+        memo[id(self)] = copied
+        return copied
+
     # Properties -----------------------------------------------------------
 
     @property
diff --git a/tests/test_array.py b/tests/test_array.py
index 9ca8d3d..0e7faf9 100644
--- a/tests/test_array.py
+++ b/tests/test_array.py
@@ -567,3 +567,17 @@ def test_item_n_dim(backend: tuple) -> None:
     a = _create_array([1.0, 2.0])
     with pytest.raises(TypeError, match=r"Only 0-dim arrays"):
             _ = a.item()
+
+
+# Copy -------------------------------------------------------------------
+
+
+def test_deepcopy(backend: tuple) -> None:
+    from copy import deepcopy
+
+    src = iop.from_numpy(np.array([1.0, 2.0, 3.0], dtype=np.float32))
+    dst = deepcopy(src)
+    np.testing.assert_allclose(_np(dst), [1.0, 2.0, 3.0])
+    # Mutating the copy shouldn't affect the original.
+    dst[0] = 99.0
+    np.testing.assert_allclose(_np(src), [1.0, 2.0, 3.0])