[perl #131855] Mix.roll doesn't work with fractional weights

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# New Ticket Created by  Brad Gilbert 
# Please include the string:  [perl #131855]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=131855 >



    > Mix( 'a' => 0.3 ).roll

    Type check failed in binding; expected Int but got Rat (0.3)
      in block <unit> at <unknown file> line 1

This worked prior to `Add R:Q.MIX-ROLL, make Mix.roll() about 2.5x as fast`[1]


[1] 
https://github.com/rakudo/rakudo/commit/a2602b9cee60f746b6012c87c146d68cb79b4bed