When creating frozen dataclasses, attribute initialization must be done using
`object.__setattr__()` it would be nice to allow attribute assignment in the
`__init__` and `__post_init__`.
Currently we have to do this :
```python
@dataclasses.dataclass(frozen=True)
class Person:
name: str
surname: str
fullname: str = dataclasses.field(init=False)
def __post_init__(self):
object.__setattr__(self, "fullname",f"{self.name} {self.surname}")
```
I think it would be more clean like this:
```python
@dataclasses.dataclass(frozen=True)
class Person:
name: str
surname: str
fullname: str = dataclasses.field(init=False)
def __post_init__(self):
self.fullname = f"{self.name} {self.surname}"
```
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