Should I open an issue on the string format not working then?

```
curl --verbose \
>      -i \
>      -H "Accept: application/json" \
>      -X PUT -d '{"ID": "mem", "Name": "Memory utilization", "Notes": "Ensure we dont oversubscribe memory", "Script": "/usr/local/bin/check_mem.py", "Interval": "10s", "TTL": "15s"}' \
>      http://localhost:8500/v1/agent/check/register

> PUT /v1/agent/check/register HTTP/1.1
> User-Agent: curl/7.30.0
> Host: localhost:8500
> Accept: application/json
> Content-Length: 165
> Content-Type: application/x-www-form-urlencoded

< HTTP/1.1 400 Bad Request
< Date: Wed, 30 Apr 2014 19:33:44 GMT
< Content-Length: 88
< Content-Type: text/plain; charset=utf-8

Request decode failed: json: cannot unmarshal string into Go value of type time.Durations826
```