LUA Scientific Conversion loose decimal

[emme]

This should work:

Code:

num = 1000000012345685
str = string.format("%.16g", num)

My issue is elsewhere...

The POST request returns 1000000012345685 as body in a JSON formatted reply
LUA Automatically converts 1000000012345685 to 1.00000001234568e+15 
I need to prevent the automatical conversion to scientific notation OR assume such number as string