jpopesculian opened a new issue, #7612:
URL: https://github.com/apache/arrow-rs/issues/7612

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   
   The `AsyncFileWriter` doesn't need to be `Send` and is therefore too 
restrictive. For context, I want to implement `AsyncFileWriter` in a WASM 
context with `js_sys` types. However, all `js_sys` types are `!Send` which 
makes it impossible to implement.
   
   **Describe the solution you'd like**
   
   Remove the `Send` requirement for `AsyncFileWriter`
   
   **Describe alternatives you've considered**
   
   I can implement the `AsyncFileWriter` using only rust types which involves 
writing to a buffer and waiting for completion, but I don't particularly want 
to do that in this context because I'd like to upload while writing to reduce 
memory usage in the browser.
   


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