Why does `web_sys::AudioBuffer::copy_to_channel*` need a mutable buffer argument?

[kerskuchen]

Summary

I hope this is the correct place to ask this. Currently I am slightly confused as to why the APIs

web_sys::AudioBuffer::copy_to_channel
https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.AudioBuffer.html#method.copy_to_channel

and

web_sys::AudioBuffer::copy_to_channel_with_start_in_channel
https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.AudioBuffer.html#method.copy_to_channel_with_start_in_channel

need their first argument (the source buffer to be copied from) to be mutable.

Additional Details

https://developer.mozilla.org/en-US/docs/Web/API/AudioBuffer/copyToChannel

[alexcrichton]

There's a whitelist of functions which are known to not need mutable slices, and it looks like this isn't on that list.

[kerskuchen]

Ah thanks for the clarification. I will try make a PR then to fix this.