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Fixed `ActiveSupport::TimeWithZone#-` so precision is not unnecessari…
…ly lost When working with objects with a nanosecond component, the `-` method may unnecessarily cause loss of precision. `ActiveSupport::TimeWithZone#-` should return the same result as if we were using `Time#-`: Time.now.end_of_day - Time.now.beginning_of_day #=> 86399.999999999 Before: Time.zone.now.end_of_day.nsec #=> 999999999 Time.zone.now.end_of_day - Time.zone.now.beginning_of_day #=> 86400.0 After: Time.zone.now.end_of_day - Time.zone.now.beginning_of_day #=> 86399.999999999
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