Whenever verb code attempts to read the value of a built-in property prop
on any object, the server checks to see if the property
$server_options.protect_prop exists and has a true value. If so,
then E_PERM is raised if the programmer is not a wizard.
Whenever verb code calls a built-in function func() and the caller
is not the object #0, the server checks to see if the property
$server_options.protect_func exists and has a true value. If so,
then the server next checks to see if the verb $bf_func() exists;
if that verb exists, then the server calls it instead of the built-in
function, returning or raising whatever that verb returns or raises. If the
$bf_func() does not exist and the programmer is not a wizard, then
the server immediately raises E_PERM, without actually calling
the function. Otherwise (if the caller is #0, if
$server_options.protect_func either doesn't exist or has a false
value, or if $bf_func() exists but the programmer is a wizard),
then the built-in function is called normally.
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