Preferences constructor

Preferences({ @JsonKey.new(name: 'lang') String language = '', @JsonKey.new(name: 'date_format') DateFormatPreference? dateFormat, @JsonKey.new(name: 'time_format') TimeFormatPreference? timeFormat, @JsonKey.new(name: 'pinned_studies') Set<String> pinnedStudies = const {}, @JsonKey.new(name: 'study_filtering') Map<String, dynamic> studyFiltering = const {}, })