MONGOID-5408 proposes to add a "Wrapper to skip evolution while querying".

As a refinement to this ticket, the wrapper should evolve values so they are compatible with the Mongo Ruby Driver, however, the evolution should be done in a field-independent manner.

Known cases where this is useful:

1. BigDecimal "raw values" should evolve to BSON::Decimal128.
2. Range values should mongoize (not evolve) to their { min: 1, max: 3 } form.
3. Array / Hash should recursively evolve to cover BigDecimal / Range members.

In most cases evolve returns the same object (Integer -> Integer, String -> String, etc.) so the implementation should probably evolve all raw values.

To illustrate how this works, consider the example:

class Person
  field :name, as: String
  field :age,  as: Integer
end

Person.where(name: Mongoid::RawValue(BigDecimal(42)))
  #=> This should query for name: 42 as BSON::Decimal128
  #   Note that the field type String is ignored.

Person.where(age: 20..30)
  #=> This queries for age $gte: 20, $lte: 30.
  #   (This is the existing behavior)

Person.where(age: Mongoid::RawValue(20..30))
  #=> this queries for age equals the Hash literal { min: 20, max: 30 }