compare_with_coercion

# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 312
  def compare_with_coercion(other)
    # we're avoiding Time#to_datetime and Time#to_time because they're expensive
    if other.class == Time
      compare_without_coercion(other)
    elsif other.is_a?(Time)
      compare_without_coercion(other.to_time)
    else
      to_datetime <=> other
    end
  end