You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: attributes.rb
    path of file: ./repos/zammad/lib/sequencer/units
    
    the code of the file until where you have to start completion: # Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

class Sequencer::Units < SimpleDelegator

  # Initializes the lifespan store for the attributes
  # of the given Units declarations.
  #
  # @param [Array<Hash{Symbol => Array<:Symbol>}>] declarations the list of Unit declarations.
  #
  # @example
  #  declarations = [{uses: [:attribute1, ...], provides: [:result], ...}]
  #  attributes = Sequencer::Units::Attributes(declarations)
  class Attributes < Delegator

    # Lists all `provides` declarations of the Units the instance was initialized with.
    #
    # @example
    #  attributes.provided
    #  # => [:result, ...]
    #
    # @return [Array<Symbol>] the list of all `provides` declarations
    def provided
      select do |_attribute, instance|
        instance.will_be_provided?
      end.keys
    end

    # Lists all `uses` declarations of the Units the instance was initialized with.
    #
    # @example
    #  attributes.used
    #  # => [:attribute1, ...]
    #
    # @return [Array<Symbol>] the list of all `uses` declarations
    def used
      select do |_attribute, instance|
        instance.will_be_used?
      end.keys
    end

    # Checks if the given attribute is known in the list of Unit declarations.
    #
    # @example
    #  attributes.known?(:attribute2)
    #  # => false
    #
    # @return [Boolean]
    def known?(attribute)
      key?(attribute)
    end

    def __getobj__
  
    
    def provided
      select do |_attribute, instance|
        instance.will_be_provided?
      end.keys
    end

    # Lists all `uses` declarations of the Units the instance was initialized with.
    #
    # @example
    #  attributes.used
    #  # => [:attribute1, ...]
    #
    # @return [Array<Symbol>] the list of all `uses` declarations
    def used
      select do |_attribute, instance|
        instance.will_be_used?
      end.keys
    end

    # Checks if the given attribute is known in the list of Unit declarations.
    #
    # @example
    #  attributes.known?(:attribute2)
    #  # => false
    #
    # @return [Boolean]
    def known?(attribute)
      key?(attribute)
    end

    def __getobj__
      @attributes
    end

    def __setobj__(declarations)
      @attributes ||= begin # rubocop:disable Naming/MemoizedInstanceVariableName
        attributes = Hash.new do |hash, key|
          hash[key] = Sequencer::Units::Attribute.new
        end

        attributes.tap do |result|

          declarations.each_with_index do |unit, index|

            unit[:uses].try(:each) do |attribute|
              result[attribute].to = index
            end

            unit[:provides].try(:each) do |attribute|
              next if result[attribute].will_be_provided?

              result[attribute].from = index
            end

            unit[:optional].try(:each) do |attribute|
              result[attribute].optional = index
            end
          end
        end
      end
    end
  end