V5.9

New Features:

- Support PATCH to a complex type. Issue [#135](https://github.com//issues/135), PR [#623](https://github.com//pull/623) - Added basic support for aggregations spec. Issue [#70](https://github.com//issues/70), PR [#594](https://github.com//pull/594) by [Konstantin Kosinsky](https://github.com/kosinsky) - Support Edm.Date with EF backend. Issue [#118](https://github.com//pull/118), PR [#600](https://github.com//pull/600) - Support "isof" query built-in function. Issue [#185](https://github.com//issues/185), PR [#646](https://github.com//pull/646) - Advertise action/function in feed payload. Issue [#637](https://github.com//issues/637), PR [#642](https://github.com//pull/642) - Bind Uri Functions to CLR methods. Issue [#612](https://github.com//issues/612), PR [#613](https://github.com//pull/613)

Bug Fixes:

- Support Pass Null to EntitySet during Feed Serialization. Issue [#617](https://github.com//issues/617), PR [#621](https://github.com//pull/621) - DataContractAttribute, etc don't work for enum type. Issue [#640](https://github.com//issues/640) - Provide an extensibility hook for consumers of ODataMediaTypeFormatter to customize base address of service root in OData uris. Issue [#644](https://github.com//issues/644), PR [#645](https://github.com//pull/645) by [Jack Freelander](https://github.com/jackfree) - Using object key for null check in expression. Issue [#559](https://github.com//issues/559), PR [#584](https://github.com//pull/584) by [Yuriy Soldatkin](https://github.com/postoronnimw)

OData Web API v5.9 package has a dependency on OData v4 Lib 6.15.