Best way of dealing with a big number of Decimal

Hello community

I am currently thinking a lot of the kind of super limited way of appian dealing with big decimal numbers.
Example:

12313139.1 as input will result in:

 1.231314e+07  

If you want to transfer this number via API (JSON input) that will cause issues as the receiving system cannot deal with the ‘e+07’ in the end.

-> is there any other approach to solve this except converting it into a string? 
The API developer will think we are unreasonable to have a decimal regardless how big, should be a text. Its not helping appians reputation withing the clients company there.
(and i can understand their thinking)

What are your thoughts on that? Do I miss there something?