Consider removing expose(), call() and kill() ?

``` javascript
worker.expose = methodName => {
worker[i] = function() {
return worker.call(methodName, [].slice.call(arguments));
};
};
```
Instead `methodName` parameter should be used:
``` javascript
worker.expose = methodName => {
worker[methodName] = function() {
return worker.call(methodName, [].slice.call(arguments));
};
};
```
Beside that I don't see why the `call` and `expose` methods are accessible from outside. (Don't assign to worker at all)
The purpose of the `kill` method is also not clear for me.

Start by tracing the public worker.expose, worker.call, and worker.kill entry points referenced in the issue. Determine the intended public API and worker lifecycle behavior before changing anything; done requires a maintainer decision plus corresponding implementation and tests, which the issue does not identify.

Escrito por el modelo de indexación a partir del texto del issue.