setteling mask flagged as NaN's

all these links and probably some more address the topic:

• #22 (closed)
• #65 (closed)
• #61 (closed)
• #45 (closed)
• !22 (closed)
• #58 (closed)

maybe we should have a a real (virtual) life discussion, about that. In some discussions we state something like: We keep it like this for now....

i guess we should settle this..