The value may be an integer but the type is floating, hence the domain error as 
u: needs an integer argument
   n=.16b1f600 
   10 u: n
😀
   10 u: {.n,1.1
|domain error
|   10     u:{.n,1.1
   {.n,1.1
128512
   datatype {.n,1.1
floating

If this were deemed enough of an irritation, a solution would be to display 
128512.0 for floating types with this value. Similarly, 128512j0 for the 
complex example.

Cheers, bob


> On Aug 26, 2016, at 1:07 PM, Don Guinn <[email protected]> wrote:
> 
> 10 u: {.n,1.1

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