document the wire type of parameter of data of function jQuery.post()

[bronze1man]

What is the wire type of parameter of data of jQuery.post()?
If I pass in an object like {"n":"bar"} , what I will get in the ajax http post body? a json like '{"n":"bar"}' or a url-encoding query like "n=bar" ?
If I pass in a string like "hello world", what I will get in the ajax http post body? Direct put in http post body?

The document at https://api.jquery.com/jquery.post/ do not tell me anything about it.

notice

• I can write a web server and use the jquery.post() to try and guess what will happen, but I want know it before I write my web server logic.
• Parameter dataType is The type of data expected from the server. , not the request data type.
• I have found some details in json $.ajax post messed up post-content when ?? in content jquery#2594 (comment) . But it is hard to find in google and it is not all the problem.