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，追蹤 array.array 的型別代碼在不同平台上的行為，並檢視相關文件。判斷哪些型別代碼保證可以在不破壞現有慣例的情況下實現；完成的標準是受支援的代碼具有一致記錄的大小，且文件解釋平台差異或新的保證。