On windows, with python 3.9, with unittests,

My test case fails when I use the following lines of code
```
result = map(lambda x: self.substitute_in_expression(x),
                     sequence.sequence)
```
It works fine with
```
result = list()
for x in sequence.sequence:
     result.append(self.substitute_in_expression(x))
```

Note that result is used as input for an inherited class instantiation:
```
        sequence_type = type(sequence)
        return sequence_type(result)
```
The classes are constructed using the dataclass decorator!


I have unfortunately not have time to make a small reproducer.
So I just send the whole project.