contents of $_POST

array(2) {
  ["userid"]=>
  string(23) "--1234"
  ["username"]=>
  string(27) "se777v77enty_five!"
}

config file contents

; filtering specified in a config file is *destructive*,
; and applied immediately when a supercage is created
;

[_POST]
*=noTags,getAlnum       ; * means apply to all values in this input array
username=getAlpha       ; apply getAlpha automatically to username
userid=getInt           ; apply getInt automatically to userid

echo $sc->post->getRaw('userid')

int(1234)

echo $sc->post->getRaw('username')

string(11) "seventyfive"