History

Time	Change
2009-05-10 10:34:06+00:00	Created
2009-05-10 10:34:06+00:00	Associated with 非数
2009-05-10 10:34:06+00:00	Associated with Not-a-Number
2009-05-10 10:34:06+00:00	Associated with NaN
2013-10-06 12:31:02+00:00	Associated with nan
2013-10-06 12:31:04+00:00	Associated with -nan