def validate_max_min_items(value, schema)
      return [nil, OpenAPIParser::MoreThanMaxItems.new(value, schema.object_reference)] if schema.maxItems && value.length > schema.maxItems
      return [nil, OpenAPIParser::LessThanMinItems.new(value, schema.object_reference)] if schema.minItems && value.length < schema.minItems

      [value, nil]