diff --git a/quaddtype/.gitignore b/.gitignore
similarity index 100%
rename from quaddtype/.gitignore
rename to .gitignore
diff --git a/quaddtype/pyproject.toml b/quaddtype/pyproject.toml
index 99b5d9c3..687b2637 100644
--- a/quaddtype/pyproject.toml
+++ b/quaddtype/pyproject.toml
@@ -4,7 +4,7 @@ requires = [
     "meson-python",
     "patchelf",
     "wheel",
-    "numpy @ file:///home/pdmurray/Desktop/numpy-1.24.0.dev0+1120.gf30af6acd-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl"
+    "numpy @ file:///home/pdmurray/Desktop/numpy-1.25.0.dev0+167.g4ca8204c5-cp311-cp311d-linux_x86_64.whl"
 ]
 build-backend = "mesonpy"
 
@@ -16,7 +16,7 @@ readme = 'README.md'
 author = "Peyton Murray"
 requires-python = ">=3.9.0"
 dependencies = [
-    "numpy @ file:///home/pdmurray/Desktop/numpy-1.24.0.dev0+1120.gf30af6acd-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl"
+    "numpy @ file:///home/pdmurray/Desktop/numpy-1.25.0.dev0+167.g4ca8204c5-cp311-cp311d-linux_x86_64.whl"
 ]
 
 [project.optional-dependencies]
diff --git a/quaddtype/quaddtype/src/casts.c b/quaddtype/quaddtype/src/casts.c
index 3df6529f..bc0ee4c2 100644
--- a/quaddtype/quaddtype/src/casts.c
+++ b/quaddtype/quaddtype/src/casts.c
@@ -29,24 +29,69 @@ quad_to_quad_resolve_descriptors(PyObject *NPY_UNUSED(self),
     return NPY_SAME_KIND_CASTING;
 }
 
+// Each element is a __float128 element; no casting needed
 static int
 quad_to_quad_contiguous(PyArrayMethod_Context *NPY_UNUSED(context), char *const data[],
-                        npy_intp const dimensions[], npy_intp const strides[], void *auxdata)
+                        npy_intp const dimensions[], npy_intp const strides[],
+                        NpyAuxData *NPY_UNUSED(auxdata))
 {
+    npy_intp N = dimensions[0];
+    __float128 *in = (__float128 *)data[0];
+    __float128 *out = (__float128 *)data[1];
+
+    while (N--) {
+        *out = *in;
+        out++;
+        in++;
+    }
+
     return 0;
 }
 
+// Elements are strided, e.g.
+//
+// x = np.linspace(40)
+// x[::3]
+//
+// Therefore the stride needs to be used to increment the pointers inside the loop.
 static int
 quad_to_quad_strided(PyArrayMethod_Context *NPY_UNUSED(context), char *const data[],
-                     npy_intp const dimensions[], npy_intp const strides[], void *auxdata)
+                     npy_intp const dimensions[], npy_intp const strides[],
+                     NpyAuxData *NPY_UNUSED(auxdata))
 {
+    npy_intp N = dimensions[0];
+    char *in = data[0];
+    char *out = data[1];
+    npy_intp in_stride = strides[0];
+    npy_intp out_stride = strides[1];
+
+    while (N--) {
+        *(__float128 *)out = *(__float128 *)in;
+        in += in_stride;
+        out += out_stride;
+    }
+
     return 0;
 }
 
+// Arrays are unaligned.
 static int
 quad_to_quad_unaligned(PyArrayMethod_Context *NPY_UNUSED(context), char *const data[],
-                       npy_intp const dimensions[], npy_intp const strides[], void *auxdata)
+                       npy_intp const dimensions[], npy_intp const strides[],
+                       NpyAuxData *NPY_UNUSED(auxdata))
 {
+    npy_intp N = dimensions[0];
+    char *in = data[0];
+    char *out = data[1];
+    npy_intp in_stride = strides[0];
+    npy_intp out_stride = strides[1];
+
+    while (N--) {
+        memcpy(out, in, sizeof(__float128));  // NOLINT
+        in += in_stride;
+        out += out_stride;
+    }
+
     return 0;
 }
 
diff --git a/quaddtype/quaddtype/src/dtype.c b/quaddtype/quaddtype/src/dtype.c
index b70da987..470245be 100644
--- a/quaddtype/quaddtype/src/dtype.c
+++ b/quaddtype/quaddtype/src/dtype.c
@@ -1,14 +1,5 @@
-#include <Python.h>
-
-#define PY_ARRAY_UNIQUE_SYMBOL quaddtype_ARRAY_API
-#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
-#define NO_IMPORT_ARRAY
-#include "numpy/arrayobject.h"
-#include "numpy/experimental_dtype_api.h"
-#include "numpy/ndarraytypes.h"
-
-#include "casts.h"
 #include "dtype.h"
+#include "casts.h"
 
 PyTypeObject *QuadScalar_Type = NULL;
 
@@ -17,8 +8,9 @@ new_quaddtype_instance(void)
 {
     QuadDTypeObject *new =
             (QuadDTypeObject *)PyArrayDescr_Type.tp_new((PyTypeObject *)&QuadDType, NULL, NULL);
-    if (new == NULL)
+    if (new == NULL) {
         return NULL;
+    }
 
     new->base.elsize = sizeof(__float128);
     new->base.alignment = _Alignof(__float128);
@@ -82,14 +74,34 @@ common_dtype(PyArray_DTypeMeta *self, PyArray_DTypeMeta *other)
     return (PyArray_DTypeMeta *)Py_NotImplemented;
 }
 
-static PyType_Slot QuadDType_Slots[] = {{NPY_DT_common_instance, &common_instance},
-                                        {NPY_DT_common_dtype, &common_dtype},
-                                        // {NPY_DT_discover_descr_from_pyobject,
-                                        // &unit_discover_descriptor_from_pyobject},
-                                        /* The header is wrong on main :(, so we add 1 */
-                                        {NPY_DT_setitem, &quad_setitem},
-                                        {NPY_DT_getitem, &quad_getitem},
-                                        {0, NULL}};
+static QuadDTypeObject *
+quaddtype_ensure_canonical(QuadDTypeObject *self)
+{
+    Py_INCREF(self);
+    return self;
+}
+
+static PyArray_Descr *
+quad_discover_descriptor_from_pyobject(PyArray_DTypeMeta *NPY_UNUSED(cls), PyObject *obj)
+{
+    if (Py_TYPE(obj) != QuadScalar_Type) {
+        PyErr_SetString(PyExc_TypeError, "Can only store QuadScalars in a QuadDType array.");
+        return NULL;
+    }
+
+    // Get the dtype attribute from the object.
+    return (PyArray_Descr *)PyObject_GetAttrString(obj, "dtype");
+}
+
+static PyType_Slot QuadDType_Slots[] = {
+        {NPY_DT_common_instance, &common_instance},
+        {NPY_DT_common_dtype, &common_dtype},
+        {NPY_DT_discover_descr_from_pyobject, &quad_discover_descriptor_from_pyobject},
+        /* The header is wrong on main :(, so we add 1 */
+        {NPY_DT_setitem, &quad_setitem},
+        {NPY_DT_getitem, &quad_getitem},
+        {NPY_DT_ensure_canonical, &quaddtype_ensure_canonical},
+        {0, NULL}};
 
 /*
  * The following defines everything type object related (i.e. not NumPy
@@ -114,7 +126,8 @@ quaddtype_dealloc(QuadDTypeObject *self)
 static PyObject *
 quaddtype_repr(QuadDTypeObject *self)
 {
-    return PyUnicode_FromString("This is a quad (128-bit float) dtype.");
+    PyObject *res = PyUnicode_FromString("This is a quad (128-bit float) dtype.");
+    return res;
 }
 
 // These are the basic things that you need to create a Python Type/Class in C.
@@ -140,7 +153,6 @@ init_quad_dtype(void)
     // do it.  You first have to create a static type, but see the note there!
     PyArrayMethod_Spec *casts[] = {
             &QuadToQuadCastSpec,
-            &QuadToFloat128CastSpec,
             NULL,
     };
 
diff --git a/quaddtype/quaddtype/src/dtype.h b/quaddtype/quaddtype/src/dtype.h
index 2427beb5..fdce9398 100644
--- a/quaddtype/quaddtype/src/dtype.h
+++ b/quaddtype/quaddtype/src/dtype.h
@@ -3,6 +3,10 @@
 
 #include <Python.h>
 
+#define PY_ARRAY_UNIQUE_SYMBOL quaddtype_ARRAY_API
+#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
+#define NO_IMPORT_ARRAY
+#include "numpy/ndarraytypes.h"
 #include "numpy/arrayobject.h"
 #include "numpy/experimental_dtype_api.h"
 
@@ -15,6 +19,7 @@ extern PyTypeObject *QuadScalar_Type;
 
 QuadDTypeObject *
 new_quaddtype_instance(void);
+
 int
 init_quad_dtype(void);
 
diff --git a/quaddtype/quaddtype/src/umath.c b/quaddtype/quaddtype/src/umath.c
index f8fed77c..86c65171 100644
--- a/quaddtype/quaddtype/src/umath.c
+++ b/quaddtype/quaddtype/src/umath.c
@@ -25,7 +25,7 @@ quad_multiply_strided_loop(PyArrayMethod_Context *context, char *const data[],
     char *in1 = data[0], *in2 = data[1];
     char *out = data[2];
     npy_intp in1_stride = strides[0];
-    npy_intp in2_stride = strides[0];
+    npy_intp in2_stride = strides[1];
     npy_intp out_stride = strides[2];
 
     while (N--) {
@@ -56,9 +56,18 @@ quad_multiply_resolve_descriptors(PyObject *self, PyArray_DTypeMeta *dtypes[],
     // The operand units can be used as-is; no casting required for quad types.
     Py_INCREF(given_descrs[0]);
     loop_descrs[0] = given_descrs[0];
+
+    if (given_descrs[1] == NULL) {
+        Py_INCREF(given_descrs[0]);
+        loop_descrs[1] = given_descrs[0];
+        return NPY_NO_CASTING;
+    }
+    Py_INCREF(given_descrs[1]);
+    loop_descrs[1] = given_descrs[1];
+
     Py_INCREF(given_descrs[1]);
     loop_descrs[1] = given_descrs[1];
-    return NPY_NO_CASTING;
+    return NPY_SAFE_CASTING;
 }
 
 // Function that adds our multiply loop to NumPy's multiply ufunc.