GNOME Bugzilla – Bug 748048
C#: Add support for the "dynamic" primitive
Last modified: 2015-04-19 12:00:44 UTC
https://msdn.microsoft.com/en-us/library/dd264741.aspx
Sure, you can add that keyword too. No need to open a new bug report for each missing keyword, you can write one patch that adds the missing keywords. (See bug #748047).
Fixed in bug #748047.