Don't try to install pytket[ZX] with Python 3.13.

.github/workflows/build_and_test.yml

@@ -290,7 +290,11 @@ jobs:
     - name: Build pytket
       run: |
         cd pytket
-        pip install -e .[ZX] -v
+        if python --version | grep -q '3.13' ; then
+          pip install -e . -v
+        else
+          pip install -e .[ZX] -v
+        fi
     - name: Run doctests
       run: |
         cd pytket
@@ -403,7 +407,11 @@ jobs:
     - name: Build pytket
       run: |
         cd pytket
-        python -m pip install -e .[ZX] -v
+        if python --version | grep -q '3.13' ; then
+          pip install -e . -v
+        else
+          pip install -e .[ZX] -v
+        fi
     - name: Run doctests
       run: |
         cd pytket
@@ -529,9 +537,14 @@ jobs:
       with:
         python-version: '3.13'
     - name: Build pytket
+      shell: bash
       run: |
         cd pytket
-        pip install -e .[ZX] -v
+        if python --version | grep -q '3.13' ; then
+          pip install -e . -v
+        else
+          pip install -e .[ZX] -v
+        fi
     - name: Run doctests
       run: |
         cd pytket

pytket/pytket/circuit/logic_exp.py

@@ -245,9 +245,7 @@ def from_dict(cls, dic: Dict[str, Any]) -> "LogicExp":
         """Load from JSON serializable nested dictionary."""
         opset_name, op_name = dic["op"].split(".", 2)
         opset = BitWiseOp if opset_name == "BitWiseOp" else RegWiseOp
-        op = cast(
-            Union[BitWiseOp, RegWiseOp], next(o for o in opset if o.name == op_name)
-        )
+        op = next(o for o in opset if o.name == op_name)
         args: List[ArgType] = []
         for arg_ser in dic["args"]:
             if isinstance(arg_ser, Constant):