[perl #131272] .pickpairs .Int-ifes the argument, but .pick doesn't (say ^5 .BagHash.pick(2.5))

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# New Ticket Created by  Aleks-Daniel Jakimenko-Aleksejev 
# Please include the string:  [perl #131272]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=131272 >


Code:
say ^5 .BagHash.pickpairs(2.5);

Result:
(1 => 1 4 => 1)


Code:
say ^5 .BagHash.pick(2.5);

Result:
count computed to 2.5, which cannot be used
  in block <unit> at <tmp> line 1


I find it impossible to predict when non-Int args are alright and when they are 
not. I would expect consistency of some sort.

(same thing with .grab and .grabpairs)