Sidekiq seems to be dropping the default []

Keep it to ensure consistency with new sidekiq versions

lib/sidekiq_unique_jobs/lock_args.rb

@@ -1,5 +1,128 @@
 # frozen_string_literal: true
 
+module SidekiqUniqueJobs
+  # Handles uniqueness of sidekiq arguments
+  #
+  # @author Mikael Henriksson <[email protected]>
+  class LockArgs
+    include SidekiqUniqueJobs::Logging
+    include SidekiqUniqueJobs::SidekiqWorkerMethods
+    include SidekiqUniqueJobs::JSON
+
+    # Convenience method for returning a digest
+    # @param [Hash] item a Sidekiq job hash
+    # @return [String] a unique digest
+    def self.call(item)
+      new(item).lock_args
+    end
+
+    # The sidekiq job hash
+    # @return [Hash] the Sidekiq job hash
+    attr_reader :item
+    #
+    # @!attribute [r] args
+    #   @return [Array<Objet>] the arguments passed to `perform_async`
+    attr_reader :args
+
+    # @param [Hash] item a Sidekiq job hash
+    def initialize(item)
+      @item         = item
+      @worker_class = item[CLASS]
+      @args         = item[ARGS]
+    end
+
+    # The unique arguments to use for creating a lock
+    # @return [Array] the arguments filters by the {#filtered_args} method if {#lock_args_enabled?}
+    def lock_args
+      @lock_args ||= filtered_args || []
+    end
+
+    # Checks if the worker class has enabled lock_args
+    # @return [true, false]
+    def lock_args_enabled?
+      # return false unless lock_args_method_valid?
+
+      lock_args_method
+    end
+
+    # Validate that the lock_args_method is acceptable
+    # @return [true, false]
+    def lock_args_method_valid?
+      [NilClass, TrueClass, FalseClass].none? { |klass| lock_args_method.is_a?(klass) }
+    end
+
+    # Checks if the worker class has disabled lock_args
+    # @return [true, false]
+    def lock_args_disabled?
+      !lock_args_method
+    end
+
+    # Filters unique arguments by proc or symbol
+    # @return [Array] {#filter_by_proc} when {#lock_args_method} is a Proc
+    # @return [Array] {#filter_by_symbol} when {#lock_args_method} is a Symbol
+    # @return [Array] args unfiltered when neither of the above
+    def filtered_args
+      return args if lock_args_disabled?
+
+      json_args = Normalizer.jsonify(args)
+
+      case lock_args_method
+      when Proc
+        filter_by_proc(json_args)
+      when Symbol
+        filter_by_symbol(json_args)
+      end
+    end
+
+    # Filters unique arguments by proc configured in the sidekiq worker
+    # @param [Array] args the arguments passed to the sidekiq worker
+    # @return [Array] with the filtered arguments
+    def filter_by_proc(args)
+      lock_args_method.call(args)
+    end
+
+    # Filters unique arguments by method configured in the sidekiq worker
+    # @param [Array] args the arguments passed to the sidekiq worker
+    # @return [Array] unfiltered unless {#worker_method_defined?}
+    # @return [Array] with the filtered arguments
+    def filter_by_symbol(args)
+      return args unless worker_method_defined?(lock_args_method)
+
+      worker_class.send(lock_args_method, args)
+    rescue ArgumentError
+      raise SidekiqUniqueJobs::InvalidUniqueArguments,
+            given: args,
+            worker_class: worker_class,
+            lock_args_method: lock_args_method
+    end
+
+    # The method to use for filtering unique arguments
+    def lock_args_method
+      @lock_args_method ||= worker_options.slice(LOCK_ARGS_METHOD, UNIQUE_ARGS_METHOD).values.first
+      @lock_args_method ||= :lock_args if worker_method_defined?(:lock_args)
+      @lock_args_method ||= :unique_args if worker_method_defined?(:unique_args)
+      @lock_args_method ||= default_lock_args_method
+    end
+
+    # The global worker options defined in Sidekiq directly
+    def default_lock_args_method
+      default_worker_options[LOCK_ARGS_METHOD] ||
+        default_worker_options[UNIQUE_ARGS_METHOD]
+    end
+
+    #
+    # The globally default worker options configured from Sidekiq
+    #
+    #
+    # @return [Hash<String, Object>]
+    #
+    def default_worker_options
+      @default_worker_options ||= Sidekiq.default_worker_options.stringify_keys
+    end
+  end
+end
+# frozen_string_literal: true
+
 module SidekiqUniqueJobs
   # Handles uniqueness of sidekiq arguments
   #