[feature request] Warning when unexpected key is loaded but not present in class

[WeberJulian]

Here is an toy scenario where it would be nice to have a warning

from dataclasses import dataclass
from coqpit import Coqpit

@dataclass
class SimpleConfig(Coqpit):
    val_a: int = 10
    val_b: int = None

if __name__ == "__main__":
    config = SimpleConfig()

    tmp_config = config.to_dict()
    tmp_config["unknown_key"] = "Ignored value"
    config.from_dict(tmp_config)
    print(config.to_json())

There the value of config.to_json() is

{
    "val_a": 10,
    "val_b": null
}

Which is expected behaviour, but we should get a warning that some keys were ignored (IMO)

[erogol]

@WeberJulian can you maybe give a code example of when it should raise an error and when it should work?

[erogol]

@WeberJulian ?

[WeberJulian]

I'll add that tonight

[WeberJulian]

I added the description @erogol

[erogol]

maybe not allowing a new attributes would be safer

[WeberJulian]

maybe not allowing a new attributes would be safer

Agreed