preventing insecure inputs

6.11: adda/abi/insuring security:
[6.13: intro:
. many app's are a security threat because
they are trusted not to smash the stack or heap,
yet will do so if given mal-formed input;
the primary security defense provided by adda
is that all interactions with the stack or heap
are handled by robust system app's .]

. an app may be expecting ascii
and get unicode instead,
but adda typetags would document what was there,
and then the app could take steps to
convert to the prefered type .
. non-native types can have novel structures;
but they are always compositions of
native elemental type;
and, the addx system is helping app's
to read and write the data they exchange .]