Open Radar

 
Summary:
NSJSONSerialization incorrectly decodes numeric values with at least 19 digits as doubles instead of long long.

A JSON string such as:

    {"number":999999999999999999}

will produce an NSNumber with an objCType of `q`, or long long. The value returned from `- (long long)longLongValue` will be exactly 999999999999999999.

However, a JSON string such as:

    {"number":1000000000000000001}

will produce an NSNumber with an objCType of `d`, or double. This can result in a loss of precision when extracting the value using `- (long long)longLongValue` on iOS 7, or when serializing the value based on the objCType.

Steps to Reproduce:
Open the attached project and run the tests.

Expected Results:
Numbers in JSON data less than LONG_LONG_MAX that do not have a decimal point should be decoded into NSNumbers with long long objCType.

Actual Results:
Numbers in JSON data with at least 19 digits result in NSNumber objects with an objCType of double.

Version:
iOS 7, iOS 8

Notes:


Configuration:
iPhone 5s, iPad 3, iPad Air, iPhone 5

Attachments:
https://github.com/jose-ibanez/JSONNumbers