Array.array Type Codes are not platforminvariant.

The platform-specific type codes interpretations for array.array make it more complex to write python code that contains known type codes and data bytes and will run reliably on all platforms. In particular, the 'l' and 'L' codes are 4 bytes on Windows, but 8 bytes on macOS. The 'i' and 'I' codes seem to be 4 in both cases, but that is a convention, not a requirement. There should be 4-byte and 8-byte integer types that guarantee that size regardless of platform---perhaps '4' and '8' for signed, '5' and '9' for unsigned. (I haven't tested other type codes.) The documentation should be updated in the meantime.

首先，跟踪 array.array 的类型代码在不同平台上的行为，并审查相关文档。确定哪些类型代码保证可以在不破坏现有约定的情况下实现；完成的标准是受支持的代码具有一致记录的大小，并且文档解释平台差异或新的保证。