* **vue-renderer:** parse JSON values before passing to bundle-renderer ([c0721c0](https://github.com/nuxt/nuxt.js/commit/c0721c0)), closes [#4439](https://github.com/nuxt/nuxt.js/issues/4439)
* csp SHA hashes accumulate when using custom script-src rules ([#4519](https://github.com/nuxt/nuxt.js/issues/4519)) ([683dbba](https://github.com/nuxt/nuxt.js/commit/683dbba))
* hmr in modern mode ([#4623](https://github.com/nuxt/nuxt.js/issues/4623)) ([df9b32a](https://github.com/nuxt/nuxt.js/commit/df9b32a))
* improvements for build and dev stability ([#4470](https://github.com/nuxt/nuxt.js/issues/4470)) ([fe05169](https://github.com/nuxt/nuxt.js/commit/fe05169))
* undefined script in modern mode ([0a21d4b](https://github.com/nuxt/nuxt.js/commit/0a21d4b))
### Features
* **modern:** auto detect modern mode ([#4422](https://github.com/nuxt/nuxt.js/issues/4422)) ([fe492d8](https://github.com/nuxt/nuxt.js/commit/fe492d8))
* check modern build file in modern mode ([#4467](https://github.com/nuxt/nuxt.js/issues/4467)) ([14fe679](https://github.com/nuxt/nuxt.js/commit/14fe679))
* preload and push modern resources in modern mode ([#4362](https://github.com/nuxt/nuxt.js/issues/4362)) ([701190d](https://github.com/nuxt/nuxt.js/commit/701190d))
* use runInNewContext: true for nuxt dev ([#4508](https://github.com/nuxt/nuxt.js/issues/4508)) ([1162f2d](https://github.com/nuxt/nuxt.js/commit/1162f2d))
* **vue-app, vue-renderer:** support meta `headAttrs` ([#4536](https://github.com/nuxt/nuxt.js/issues/4536)) ([9961453](https://github.com/nuxt/nuxt.js/commit/9961453))