DataView / ArrayBuffer ergonomics are not well discoverable

[chrysn]

Motivation

Working with Web Bluetooth, web-sys APIs give me js_sys::DataView objects. Conceptually, these are JavaScript's version of (typed) slices. Accessing them as slices is hard, though.

Proposed Solution

The documentation of DataView and Array should point users to the family of types around js_sys::Uint8Array, and how to turn one that was obtained into a such an array (my naïve let ble_response: js_sys::Uint8Array = characteristic.read_value().js2rs().await?.into(); did not do the trick).

Alternatives

Up until in-depth documentation review with some guessing jumps, I turned my data views into vectors going through my_vec.extend((0..ble_response.byte_length()).map(|i| ble_response.get_uint8(i))) on them. This feels extremely unergonomic and inefficient.