Large integers cause rounding errors

[cbartondock]

Same issue as here node-steam/vdf#12

Large integers (or strings that contain numerical values that get interpreted as integers) get rounded, even if they were initially intended as strings. See the following repl:

https://replit.com/@ChrisDock/Testing-node-steamvdf-for-long-strings#index.js

[p0358]

In the meantime one can use the option types: false to keep every value as a string, I'll soon look into adding some BigInt support. Just not sure if enabling it should make all numbers BigInt or only those that are too big to be represented within 48 bits of precision, probably the latter. It would be disabled by default, as BigInt could break existing code that relies on normal numbers

[cbartondock]

Yet another solution might be to encode the type in the vdf. This is what I ended up doing, eg. A number 1234 gets encoder as "n1234" which is then parsed as 1234, whereas a string "1234" gets encoded as "s1234" which is parsed as "1234"

This amounts to essentially altering the vdf rules and would break in many situations where other programs are reading the vdf, but it worked perfectly for me.