[Jgeneral] Are 32bit integers in 64bit J possible?

[Anssi Sepp�l]

Is it (even in theory) possible that 64 bit J could have 32 bit 
integers? The motivation is that integer mapped files of J64 require 
double size compared to J32. 1,5 GB J32 mapped is equivalent to 3 GB 
J64 mapped file and the GBs of RAM have a price.
Anssi
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