Parser unable to handle large floating point numbers

[sharathvemula]

When parsing JSON which has large floating point numbers, I'm observing program crash.

Please describe the steps to reproduce the issue.

1. Make the repo locally
2. Extract the Failure_repro.zip attached and place the test.cpp file in json/include/ folder.
3. Compile using g++ -I. Test.cpp
4. Parse a JSON file whose name is provided using command line arguments using

Can you provide a small but working code example?

ifstream json_file(argv[1])
auto j3 = json::parse(json_file)

Also, please check Test.cpp attached.

What is the expected behavior?

JSON should be parsed with no crash.

And what is the actual behavior instead?

The cpp file with the above code content crashed with error.

Which compiler and operating system are you using?

• Compiler: gcc 9.4.0
• Operating system: Ubuntu 20.04.3 LTS

Which version of the library did you use?

• latest release version 3.10.5

• other release - please state the version: ___
  Failure_repro.zip

• the develop branch

If you experience a compilation error: can you compile and run the unit tests?

• yes
• no - please copy/paste the error message below

[nlohmann]

What is the error/exception message?

[nlohmann]

Also note https://json.nlohmann.me/features/types/number_handling

[nlohmann]

Your example well-exceeds any 64-bit number type. The library will throw

[json.exception.out_of_range.406] number overflow parsing '...' 

in this case which is the expected and documented behavior.