Not sure if this is a bug or a feature:

Writing a boolean label on an image seems to produce rather strange behaviour.

For example,
odb>ls /Equipment/gas/settings/my_bool -lt
Key name                        Type    #Val  Size  Last Opn Mode Value
---------------------------------------------------------------------------
my_bool                         BOOL    1     4     14m  0   RWD  y


odb>cd /custom/images/my_image.gif/labels
odb>ls
Src                             /Equipment/gas/settings/my_bool
Format                          val: %d (bool)
Font                            Medium
X                               10
Y                               10
Align                           0
FGColor                         FFFFFF
BGColor                         FF8800

Instead of the expected string "val: y (bool)", only the value of the key
appears, i.e. "y". 
The behaviour is the same whether I use %d, %u, %s, %c etc as the format character.