Extended Basic Types - yaml/YAML2 GitHub Wiki

This may be something to consider as an optional extension. Complex maths support.

{ complexCart: 1+1i, complexPolar: 1/_90Deg , complexPolar: 1/_0.1Rad }

Or alternatively also support recognizing ISO 8601 datetime?

{ date: 2015-04-19T12:59:23+00:00 }