data-format

When I try to build project that depends on ron@0.7.0 for target wasm32-unknow-emscripten, I have lot of messages like this:

  --> /home/caiiiycuk/.cargo/registry/src/github.com-1ecc6299db9ec823/ron-0.7.0/src/de/id.rs:74:5
   |
74 | /     fn deserialize_i128<V>(self, _: V) -> Result<V::Value>
75 | |     where
76 | |         V: Visitor<'b>,
77 | |     {
78 | |         unimplemented!("I

As explained here: https://github.com/edn-format/edn#integers
integers ending with an N have arbitrary size. We should parse them as the JS type bigint.