Error when using Puck.eval in Web Bluetooth

I've now added some queueing functionality to the puck.js file at https://espruino.github.io/js/puck.js

Please could you give it a go? You should now be able to call Puck.write and eval right after each other, and it'll queue the eval until the write has finished.

It'll be a little slower since it waits to receive all of the data from the Puck.write command before executing whatever is next, but I think that's probably worth it. For high speed stuff you can still use Puck.connect.