lack of very important uint64/int64

[lygstate]

Js doesn't support for uint64/int64 leading to a lot of
issues in real productive environmen

[asilvas]

+1

[themihai]

uint64/int64 can be handled using a library (i.e. BigNumber) though builtin support it would be awesome.

[lygstate]

Yeap, indeed FFI and CTypes need this.