Mahdi Ben Jelloul

Elle est définie [ici](https://github.com/openfisca/openfisca-core/blob/master/openfisca_core/taxscales.py#L403).

@eraviart @Sasha-Laniece : La revue va être assez compliquée ? Déjà est-ce que l'on peut vérifier que l'on n'effacer jamais une entrée définitivement ? Après est-ce que l'on peut procéder...

The second solution looks more discoverable to our specific user/dev base.

@maukoquiroga @MattiSG @sandcha how should we implement that ?

@MattiSG : would you agree with the second solution. It is more flexible and more useful for doing some try and error when writing some peace of legislation.

@nikhilwoodruff : we already have some tools in [here](https://github.com/openfisca/openfisca-survey-manager/blob/6f03aef71b2398861fc7ebf7891048ce16ddaf36/openfisca_survey_manager/utils.py). Let me know what fits your use-case. These tools were hosted by `openfisca-survey-manager` because they were not identified as crucial for...

I agree with you @nikhilwoodruff. Feel free to propose something more general.

I do not understand this one ... > parameters.some_uprated_parameter("2017-01-01") == 6 # == 2 * 2/1 I understand your need to enrich the metadata with an updating parameter and I...

Hi @maukoquiroga : I am not very qualified to review all this work which BTW seems very substantial and valuable. I am just wondering why you changed may methods `_foo`...

@maukoquiroga: 1. variables belongs to an entity (they are a characteristic of an entity). Entities help you describe the model. Populations are the actual "holders" of the data. 2. I...