deParam() mangles large numbers

[sebkun]

Part of the deParam() code tries to parse numeric values into Javascript numbers. However, since javascript stores all numbers as doubles, any number larger than around 2^53 will suffer a loss of precision when converted.

E.g.: var longNum = "123456789012346578901234567980"; var urlStr = "http://www.example.com/?key=" + longNum; var url = $.url.parse(urlStr); alert(url.params['key']); // 1.2345678901234658e+29

In my code I worked around this by changing: val = val && !isNaN(val) ? +val // number to val = val && !isNaN(val) && val < 0x20000000000000 ? +val // number

[cowboy]

If you don't want $.deparam to attempt to coerce strings into numbers, you can simply not specify the coerce argument. Have you tried that?

[sebkun]

Good point, although then it doesn't convert other values and in my use case the loss of precision for large numbers (random 64-bit IDs) was undesirable.

[willemstuursma]

Javascript does not support numbers > 2^53, you should keep them as strings in that case.