Type checking of URL queries is too strict

[hectorj]

See the failing test in #29

Because parse_str is used on the query string, all query parameters are considered to be strings.

Is there currently a way to have a PSR7 Request matching a int type on a query parameter?

[hectorj]

And to answer the "query string only support strings": both the Swagger specification documentation and the fixture schema used in this repo seems to consider it valid.

So there should be a way to validate it.

I've tried upgrading the justinrainbow/json-schema dependency to be able to use some loose type check, but I haven't gotten it to work yet with all the BC breaks the upgrade brings.

[francescozanoni]

Hi,
according to https://github.com/justinrainbow/json-schema#type-coercion, values sent via HTTP query string (and headers, I suppose) can be correctly managed by this library, at least since Oct 2016.
Couldn't this fix the issue?
Thanks!