I see that mapped files now supports boxed data. Studying
http://www.jsoftware.com/jwiki/Guides/Named%20Noun%20Internals I tried to
use viewnoun on a name containing boxed data. Got a domain error on memr
(15!:1). Memory management in J help does not list boxed (32) as a valid
data type for memory management. Is that the reason that memr crashed? There
are several other data types other than 2, 4, 8 and 16. Should they be added
to the list of valid data types or does memr not support them?

I got here because I wanted to be able to define a mapped noun into the
middle of an existing name, not just offsetting the starting point, but also
limit the ending point. Not too hard to do with data types 2, 4, 8 and 16,
but what happens with other data types?

What I was thinking about was wondering how to pick a subset of the boxes to
map. Bit of a stretch?
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