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Try to write the code as declarative as you possible can (that usually means in functional style):

def transform
  special_values = {"1" => true, "0" => false}
  Hash[preferences.map { |k, v| [k.to_sym, special_values.fetch(v, v)] }]
end

However, since I don't like Hash[...] and prefer Enumerable#mash, I'd really write preferences.mash { |k, v| [k.to_sym, special_values.fetch(v, v)] }.