Importing numbers with json encoding

#### Version information:

go-ipfs version: 0.7.0
Repo version: 10
System version: amd64/darwin
Golang version: go1.14.4

#### Description:

Importing `1` with json encoding results in cbor for `1.0`:

```console
$ echo 1 | ipfs dag put --input-enc json
bafyreihtx752fmf3zafbys5dtr4jxohb53yi3qtzfzf6wd5274jwtn5agu
$ ipfs block get bafyreihtx752fmf3zafbys5dtr4jxohb53yi3qtzfzf6wd5274jwtn5agu | xxd
00000000: fb3f f000 0000 0000 00 .?.......
```

Plugging that into cbor.me shows '1.0': http://cbor.me/?bytes=fb3ff0000000000000

js-IPFS does it differently:

```console
$ echo 1 | jsipfs dag put --input-enc json
bafyreicl6ujc6ncfktctxxroxognfn7d2fqavvrryoc2lv6m4i6hpbkfti
$ jsipfs block get bafyreicl6ujc6ncfktctxxroxognfn7d2fqavvrryoc2lv6m4i6hpbkfti | xxd
00000000: 01 .
```

This shows `1`: http://cbor.me/?bytes=01

They seem to agree on non-whole numbers though:

```
$ echo 10.1 | ipfs dag put --input-enc json
bafyreif6mmzorbl3afjsxe56edgibwbmhaje5k744nxioruox4kixlkr4u
$ echo 10.1 | jsipfs dag put --input-enc json
bafyreif6mmzorbl3afjsxe56edgibwbmhaje5k744nxioruox4kixlkr4u
```