Newtonsoft.json: Deserializing a number with a leading zero

[xctmaf]

For example

{ "number":0100 }

if look at JsonTextReader.ParseNumber() you can see

long value2 = text2.StartsWith("0x", StringComparison.OrdinalIgnoreCase) ? Convert.ToInt64(text2, 16) : Convert.ToInt64(text2, 8);

it can throw System.FormatException (ex.: "09999").

In ECMA-404 The JSON Data Interchange Standard number must be only in 10base.

[JamesNK]

Json.NET handles them an octal in JsonTextReader. It is by design.