> This specification allows implementations to set limits on the range
and precision of numbers accepted. Since software that implements
IEEE 754 binary64 (double precision) numbers [IEEE754] is generally
available and widely used, good interoperability can be achieved by
implementations that expect no more precision or range than these
provide, in the sense that implementations will approximate JSON
numbers within the expected precision. A JSON number such as 1E400
or 3.141592653589793238462643383279 may indicate potential
interoperability problems, since it suggests that the software that
created it expects receiving software to have greater capabilities
for numeric magnitude and precision than is widely available.
> Note that when such software is used, numbers that are integers and
are in the range [-(2^53)+1, (2^53)-1] are interoperable in the
sense that implementations will agree exactly on their numeric
values.
Or to paraphrase: if you pretend that every JSON number is a JavaScript number (double-precision float), you will generally be fine. If you don’t, you are responsible for the inevitable interpoperability problems you’ll have with most current JSON parsers.
