instance method permit_value

# File actionpack/lib/action_controller/metal/strong_parameters.rb, line 1361
      def permit_value(value, filter, on_unpermitted:,  explicit_arrays:)
        if filter == EMPTY_ARRAY # Declaration { comment_ids: [] }.
          permit_array_of_scalars(value)
        elsif filter == EMPTY_HASH # Declaration { preferences: {} }.
          permit_hash(value, filter, on_unpermitted:, explicit_arrays:)
        elsif array_filter?(filter) # Declaration { comments: [[:text]] }
          permit_array_of_hashes(value, filter.first, on_unpermitted:, explicit_arrays:)
        elsif explicit_arrays # Declaration { user: { address: ... } } or { user: [:name, ...] } (only allows hash value)
          permit_hash(value, filter, on_unpermitted:, explicit_arrays:)
        elsif non_scalar?(value) # Declaration { user: { address: ... } } or { user: [:name, ...] }
          permit_hash_or_array(value, filter, on_unpermitted:, explicit_arrays:)
        end
      end