JSON boolean fields not displayed correctly
There is no boolean type in the admin for the JSON fields, there is only "choice" which is also for typos fields (with list of choices).
On the record form, there is no check box (consequence of the previous point)
On the presentation sheet, false and true are not translated into yes/no oui/non.
By the way, for all boolean fields (i.e. also for Ishtar fields), it could be better to have a check sign or something like that on presentation sheets.