Rails core - Dec 2013 - [ActiveModel::Validations] Add an option in for the numeric validation

Hi,

I searched any topics about the option 'in' for the numeric validations
in
the models but I found nothing. Thus, I suggest to add the ability to 
define the options of the validation with help of Range of Numeric values. 
The benefit will be the reduction of validation size in the models 
simplifying maintenance and reading of the code.

We could change this code:

class Person
  validates_numericality_of :age, greater_than_or_equal_to: 1,
less_than_or_equal_to: 100end


by:

class Person
  validates_numericality_of :age, in: 1..100end


I've prepared an implementation for this feature. Thus, can I submit a pull 
request with this feature?

Best regards.

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