module Hashie::Extensions::Dash::Coercion::ClassMethods

def property(property_name, options = {})

* :coerce - The class into which you want the property coerced.

Hashie::Dash#property options plus:
Defines a property on the Dash. Options are the standard 
def property(property_name, options = {})
  super
  coerce_key property_name, options[:coerce] if options[:coerce]
end