generalized IntMap - IntegerMap or IntegralMap

Henning Thielemann lemming at
Mon Jan 22 08:44:23 UTC 2018

I want to use Word32 or Word64 bit patterns as indices for a Map. I have 
checked that IntMap is more efficient than Map in my application. However, 
the Haskell 98 report warrants only 30 bits for Int including the sign 
bit. Is there a generalization of IntMap for Map Integer or (Integral k, 
Bits k) => Map k or would there be general interest in such a data 

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