Valeriy V. Vorotyntsev

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to chose either at their option

> The value should work with data type `float64`, but at first the value is smaller so inferred as an `int64`, lately the value has become bigger and bigger, and...

I see. [It looks like](https://stackoverflow.com/questions/13502398/json-integers-limit-on-size#comment80159722_13502497) JSON integers are limited to `[-(2**53)+1, (2**53)-1]`.

> This might be intentional for docs.rs example? Oh. I wasn't aware of this peculiarity of docs.rs. Shall we close the PR then?