instantiating multiple WKWebViews leads to app crash

As far as I understood, straining memory with `WKWebView` should terminate individual processes, but not crash the whole app.

Instantiating blank (ie `uri: undefined`) `WKWebView`s causes no issues. It depends on available memory how many views can a device handle. First gen. App on first iPad mini crashes already with 3 instances of `WKWebView`.

I tried various techniques of removing unused web views or unloading their content (ie setting their source to `{ uri: undefined }`), however was not able to avoid the crashes.

Is there something missing in the native bridge (for example response to `didReceiveMemoryWarning`)? Or am I missing something? Thank you!

Reference gist: https://gist.github.com/tomasc/6e0efe94c388f293b60da1d191a1e89e