Mutable slice passed for FileSystemSyncAccessHandle 's write functions in web_sys

[kipcode66]

Describe the Bug

The type FileSystemSyncAccessHandle of the web_sys crate has two write functions which can take a u8 slice to write to the handle. However, the slice has to be passed as mutable, which can be a problem if you want to integrate it with any kind of Write trait from std or other synchronous or asynchronous crates, which only provide an immutable reference to the slice of data to write.

Steps to Reproduce

N/A

Expected Behavior

I expect the write functions write_with_u8_array and write_with_u8_array_and_options to take an immutable reference for the slice of data to write.

Actual Behavior

The write functions write_with_u8_array and write_with_u8_array_and_options only accept mutable slices.

Additional Context

N/A