Guidance needed on using de-serialization libraries with CADQuery editor

I have a simple CADQuery script that makes use of several data classes, including this one:

```
@dataclass
class Point2:
'''Represents a 2D point.'''
x : float
y : float
```

I'd like to be able to de-serialize instances of these data classes from Python dictionaries (and later JSON) so I turned to _mashumaro_, which requires this mixin style:

```
@dataclass
class Point2(DataClassDictMixin):
'''Represents a 2D point.'''
x : float
y : float
```

De-serializing data class instances works as expected using this script from the command line, but when run in the CADQuery editor I can see an error in the Current Traceback window `KeyError: Temp` with the line pointing to the first mixed in data class. Execution stops at that point.

Okay, so I tried doing de-serialization with _dacite_, with no mixins required, but the editor gives the same error, this time pointing to the relevant `from_dict(...)` line. Again, the script works as expected when run from the command line.

Is there something special about running these scripts in the editor that I need to take into account?

I'm returning to Python (for CADQuery) after a very long break from using it, so I could well have misunderstood how to go about this.