call ids are not displayed properly in write mode

[programLyrique]

view_call_ids(db) show a data frame with the right number of values, but no call ids in write mode.
It works in read mode.

[fikovnik]

Ideally, what we want is the following output:

data.frame<
  call_id: int, 
  pkg_name: chr, 
  fun_name: chr, 
  args_idx: named ints[], 
  rtrn_idx: int
>

containing indices of all the argument