jq change 64 bit integers

[borisz]

Here is an example:

jq --version
jq-1.4

echo '{"out_n":15878708649682983132,"h16":"dc5c81634c46d8dc"}' | jq .
{
  "out_n": 15878708649682983000,
  "h16": "dc5c81634c46d8dc"
}

[nicowilliams]

Duplicate of #218 and #369 (and others).

[nicowilliams]

Basically, jq uses IEEE 754 ("C doubles") for number representation internally. We know we need to add big number support.