N(e){return"string"==typeof e?F[e]||F[e.toLowerCase()]:void 0}function J(e){var a,t,s={};for(t in e)h(e,t)&&(a=N(t))&&(s[a]=e[t]);return s}var R={};function C(e,a){R[e]=a}function I(e){return e%4==0&&e%100!=0||e%400==0}function U(e){return e<0?Math.ceil(e)||0:Math.floor(e)}function G(e){var a=+e,t=0;return 0!=a&&isFinite(a)&&(t=U(a)),t}function V(a,t){return function(e){return null!=e?(K(this,a,e),M.updateOffset(this,t),this):B(this,a)}}function B(e,a){return e.isValid()?e._d["get"+(e._isUTC?"UTC...

* Update example upgrade in docs main page. PR [#795](https://github.com/tiangolo/fastapi/pull/795) by [@cdeil](https://github.com/cdeil).
* Fix callback handling for sub-routers. PR [#792](https://github.com/tiangolo/fastapi/pull/792) by [@jekirl](https://github.com/jekirl).