fix auto graph stripping

src/copapy/_basic_types.py

@@ -336,7 +336,7 @@ class CPConstant(Node):
         self.dtype, self.value = _get_data_and_dtype(value)
         self.name = 'const_' + self.dtype
         self.args = tuple()
-        self.node_hash = hash(value) if constant else id(self)
+        self.node_hash = hash(value) ^ hash(self.dtype) if constant else id(self)
 
 
 class Write(Node):

src/copapy/_compiler.py

@@ -102,19 +102,24 @@ def get_all_dag_edges(nodes: Iterable[Node]) -> Generator[tuple[Node, Node], Non
         Tuples of (source_node, target_node) representing edges in the DAG
     """
     emitted_edges: set[tuple[Node, Node]] = set()
-    used_nets: set[Net] = set()
+    used_nets: dict[Net, Net] = {}
     node_list: list[Node] = [n for n in nodes]
 
     while(node_list):
         node = node_list.pop()
         for net in node.args:
-            if net not in used_nets:
-                used_nets.add(net)
-                edge = (net.source, node)
-                if edge not in emitted_edges:
-                    yield edge
-                    node_list.append(net.source)
-                    emitted_edges.add(edge)
+
+            # In case there is already net with equivalent value use this 
+            if net in used_nets:
+                net = used_nets[net]
+            else:
+                used_nets[net] = net
+
+            edge = (net.source, node)
+            if edge not in emitted_edges:
+                yield edge
+                node_list.append(net.source)
+                emitted_edges.add(edge)
 
 
 def get_const_nets(nodes: list[Node]) -> list[Net]: