fails:Float#to_s uses non-e format for a positive value with whole part having 16 decimal places
fails:Float#to_s uses non-e format for a negative value with whole part having 15 decimal places
fails:Float#to_s outputs the minimal, unique form necessary to recreate the value
fails:Float#to_s uses e format for a positive value with whole part having 16 decimal places
fails:Float#to_s uses e format for a negative value with whole part having 16 decimal places
fails:Float#to_s uses e format for a positive value with whole part having 18 significant figures
fails:Float#to_s uses e format for a negative value with whole part having 18 significant figures
