How to pass arguments to html_form_set

[fedecupe]

From the documentation of html_form_set I read

Name-value pairs giving fields to modify.

But I'm not able to pass an existing list of name-value pairs (which I need to programmatically name/rename in my code).

Am I doing something wrong or is there an error in the code?

A small example The form:

> pgform
<form> 'login-form' (POST https://website.ext/admin/login/?next=/admin/)
  <field> (hidden) csrfmiddlewaretoken: 48cy2g2QZGzzxVMws...
  <field> (text) username: 
  <field> (password) password: 
  <field> (hidden) next: /admin/
  <field> (submit) : Accedi

THIS WORKS

> login <- pgform %>% html_form_set(
  username = "user",
  password = "pass")

> login
<form> 'login-form' (POST https://website.ext/admin/login/?next=/admin/)
  <field> (hidden) csrfmiddlewaretoken: 48cy2g2QZGzzxVMws...
  <field> (text) username: user
  <field> (password) password: ********
  <field> (hidden) next: /admin/
  <field> (submit) : Accedi

> session_submit(session,login,submit=NULL,user_agent(uastring),config(referer=arci$url))

But if I try to do this

> credentials <- as.list(c(username="user",password="pass"))
> login <- pgform %>% html_form_set(credentials)

The form doesn't get filled (BUT NO ERROR OCCURS)

> login
<form> 'login-form' (POST https://website.ext/admin/login/?next=/admin/)
  <field> (hidden) csrfmiddlewaretoken: 48cy2g2QZGzzxVMws...
  <field> (text) username: 
  <field> (password) password: 
  <field> (hidden) next: /admin/
  <field> (submit) : Accedi