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• os.FS is not enough to cover all file system including virtual file system or cloud file system.
• Go-lang's file handling or IO usually need to handle OS specific stuff even for fundamental operation such as file move (need to consider drive diff on Windows)

Context:

• Golang's error handling sometimes cause readability issue.
• There is usually no clear guidance about a cause, such as an error for a file operation. That need to verify an error in various ways. e.g. compare with constant Err* value, use IsXxx func to ensure error, and so on.

• Case converter
• Tokenizer

• Semantic versioning format
• UUID format

The library that handle message queue like mpsc (https://doc.rust-lang.org/std/sync/mpsc/) in Rust.
The mpsc is easily implemented with channel. This mpsc need to handle consumer thread (that should be a single-thread).