Time objects fail to round-trip with equality

[segiddins]

I ran the following script:

require 'yaml'

puts Psych::VERSION

def compare(time)
  dumped = YAML.dump(time)
  loaded = YAML.load(YAML.dump(time))
  equal = loaded == time

  pp(
    original: time,
    loaded: loaded,
    equal: equal,
#    nsec: { original: time.nsec, loaded: loaded.nsec, equal: time.nsec == loaded.nsec }
    float: { original: time.to_f, loaded: loaded.to_f, equal: time.to_f == loaded.to_f }
  )
end

compare(Time.new(2002, 4, 5, 6, 7, 8.9992321))
compare(YAML.load YAML.dump Time.new(2002, 4, 5, 6, 7, 8.9992321))

And got the following output:

3.0.2
{:original=>2002-04-05 06:07:08 -0800,
 :loaded=>2002-04-05 06:07:08 -0800,
 :equal=>false,
 :float=>
  {:original=>1018015628.999232, :loaded=>1018015628.9992322, :equal=>false}}
{:original=>2002-04-05 06:07:08 -0800,
 :loaded=>2002-04-05 06:07:08 -0800,
 :equal=>true,
 :float=>
  {:original=>1018015628.9992322, :loaded=>1018015628.9992322, :equal=>true}}

I would expect both Time instances to compare equal to their dumped & loaded counterpart, but the first does not. By inspection, we can see that the Time#to_f of the original & loaded instances are different, which I'd guess is what's breaking Time#==. Curiously, the Time#nsec property is preserved properly.