flutter pub add fixnum根據套件公開資料產生的選型評估，僅供參考。
fixnum 套件提供 32 位與 64 位有符號固定寬度整數類型，確保在 Dart 的原生與 JavaScript 執行環境中行為一致。它解決了不同平台之間整數處理的差異，特別是在網路環境中 JavaScript 使用浮點數來表示整數的情況。此套件非常適合需要在任何執行環境中都能實現可預測運算與位元運算之應用程式。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
This repository is home to various Dart packages under the dart.dev publisher.
| Package | Description | Issues | Version |
|---|---|---|---|
| args | Library for defining parsers for parsing raw command-line arguments into a set of options and values using GNU and POSIX style options. |  |
 |
| async | Utility functions and classes related to the 'dart:async' library. | |
 |
| characters | String replacement with operations that are Unicode/grapheme cluster aware. | |
 |
| collection | Collections and utilities functions and classes related to collections. | |
 |
| convert | Utilities for converting between data representations. Provides a number of Sink, Codec, Decoder, and Encoder types. | |
 |
| crypto | Implementations of SHA, MD5, and HMAC cryptographic functions. | |
 |
| fixnum | Library for 32- and 64-bit signed fixed-width integers with consistent behavior between native and JS runtimes. | |
 |
| lints | Official Dart lint rules. Defines the 'core' and 'recommended' set of lints suggested by the Dart team. | |
 |
| logging | Provides APIs for debugging and error logging, similar to loggers in other languages, such as the Closure JS Logger and java.util.logging.Logger. | |
 |
| os_detect | Platform independent OS detection. | |
 |
| path | A string-based path manipulation library. | |
 |
| platform | A pluggable, mockable platform information abstraction for Dart. | |
 |
| typed_data | Utility functions and classes related to the dart:typed_data library. | |
 |
For information about our publishing automation and release process, see https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.
For additional information about contributing, see our contributing page.