'bootstrap_expect' expected type 'int', got unconvertible type 'string', value: '1'

#### Overview of the Issue

When using json config, I get `* 'bootstrap_expect' expected type 'int', got unconvertible type 'string', value: '1'`

I am not sure if this is a feature request or a bug report - I understand that I used `bootstrap_expect: "1"` instead of `bootstrap_expect: 1`, but asking if this can be supported.

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#### Reproduction Steps

### Consul info for both Client and Server

Client info

```
Output from client 'consul info' command here
```

```
Client agent HCL config
```

Server info

```
Output from server 'consul info' command here
```

```
Server agent HCL config
```

### Operating system and Environment details

### Log Fragments

Start by reproducing the JSON configuration error with `bootstrap_expect` set to the string value `"1"`, then trace how that setting is parsed. Define and test the expected behavior for string versus integer values; the issue names no source files or tests, so locating the relevant configuration parsing code is part of the work.

Written by the indexing model from the issue text.