Adding duration to time

[sandstrom]

Would be great if one could add a duration to time, yielding a new time instance.

Time.now + Duration.new(:days => 1) #=> time_at_one_day_from_now

Ruby's coerce should also be helpful here, so that the ordering doesn't matter:

• https://www.mutuallyhuman.com/blog/2011/01/25/class-coercion-in-ruby/
• http://c2.com/cgi/wiki?RubyCoerce

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# Similarly, I would expect
Duration.new(:days => 2) + Time.now === Time.now.advance(:days => 2)

# Currently this is instead:
Duration.new(:days => 2) + Time.now # => seconds since 1970 + 2 days (as `Duration`)

# While this is one possible interpretation It's fairy non-sensical, 
# i.e. it's not very useful, while a result that returned a new time instance 
# would make durations much more useable!