delwin() and deleting windows with subwindows

[Bill Gray]

   The man page for this function [1] says

    "...Calling delwin deletes the named window, freeing all memory 
associated  with  it... Sub-windows must be deleted before the main 
window can be deleted."

   And under "return value",  it says that delwin "returns an error 
value... if the window is the parent of another window."

   I wrote a small bit of test code [2] that seems to confirm all this, 
 at least with ncurses-6.2.

   The problem is that further down the man page,  under "portability", 
 it says :

   "Since release 4.0 (1996), ncurses maintains a list of windows for 
each screen,  and is able to recursively delete subwindows when asked to 
delete their parent.  NetBSD copied this feature of ncurses in 2003."

   I've implemented the recursive deletion for PDCursesMod.  But now 
I'm wondering if I should have just returned an error code if delwin() 
is called for a parent window.  Easy enough either way,  but I don't 
know which way to go.

Thanks!            -- Bill

[1] https://www.invisible-island.net/ncurses/man/curs_window.3x.html
[2] https://www.projectpluto.com/temp/del_test.c