Since we are on ? #. and x: subject, here is a trick question
 
   require 'plot'
   t=:?10^100x
   plot x;((100) 6!:2 ' #.inv t' ,~ ":)"> x=.10000+i:20

Why there is a performance hit at 10000 and not 10001, as one would expect if
extended integers were represented base 10000?
 
My guess is another < vs <: bug, possibly in #./#: family.
                                          
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