Revert "Don't use JSON::Type, use JSON::Any instead"

This reverts commit 34475b986a486730d696ddf52250c38d7e0cfe4a.

spec/param_parser_spec.cr

@@ -174,7 +174,7 @@ describe "ParamParser" do
       body_params.to_s.should eq("")
 
       json_params = Kemal::ParamParser.new(request).json
-      json_params.should eq({} of String => Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Any) | Array(JSON::Any))
+      json_params.should eq({} of String => Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Type) | Array(JSON::Type))
     end
   end
 

spec/route_handler_spec.cr

@@ -85,6 +85,7 @@ describe "Kemal::RouteHandler" do
     post "/" do |env|
       skills = env.params.json["skills"].as(Array)
       skills_from_languages = skills.map do |skill|
+        skill = skill.as(Hash)
         skill["language"]
       end
       "Skills #{skills_from_languages.each.join(',')}"

src/kemal/param_parser.cr

@@ -8,7 +8,7 @@ module Kemal
     MULTIPART_FORM   = "multipart/form-data"
     PARTS            = %w(url query body json)
     # :nodoc:
-    alias AllParamTypes = Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Any) | Array(JSON::Any)
+    alias AllParamTypes = Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Type) | Array(JSON::Type)
     getter files
 
     def initialize(@request : HTTP::Request)
@@ -89,7 +89,7 @@ module Kemal
       case json = JSON.parse(body).raw
       when Hash
         json.each do |key, value|
-          @json[key] = value.raw
+          @json[key] = value.as(AllParamTypes)
         end
       when Array
         @json["_json"] = json