nested_under_indifferent_access

Called when object is nested under an object that receives #with_indifferent_access. This method will be called on the current object by the enclosing object and is aliased to #with_indifferent_access by default. Subclasses of Hash may override this method to return self if converting to an ActiveSupport::HashWithIndifferentAccess would not be desirable.

b = { b: 1 }
{ a: b }.with_indifferent_access['a'] # calls b.nested_under_indifferent_access
# => {"b"=>1}