Attempt parsing raw string before calling to_json

[matthewmcgarvey]

Connected to luckyframework/lucky#1661

When we call params.nested(:user) we get back a Hash(String, String). The String value is a stringified version of the json object which the current implementation would not parse correctly. This new overload attempts to parse the raw string value before calling .to_json on it.

This does change behavior:

JSON::Any.adapter.parse("true") #=> "true" : JSON::Any (before)
JSON::Any.adapter.parse("true") #=> true : JSON::Any (after)

JSON::Any.adapter.parse("1") #=> "1" : JSON::Any (before)
JSON::Any.adapter.parse("1") #=> 1 : JSON::Any (after)

JSON::Any.adapter.parse("{\"foo\":\"bar\"}") #=> "{\"foo\":\"bar\"}" : JSON::Any (before)
JSON::Any.adapter.parse("{\"foo\":\"bar\"}") #=> {"foo" => "bar"} : JSON::Any

I believe these tradeoffs are acceptable because most JSON::Any columns aren't doing scalar values anyways and this new way is more true to intention especially being constrained by how Lucky::Params works.

[jwoertink]

Works for me!