hoon: updates +muk to truncate seed and removes spurious assertion
++ muk :: standard murmur3
~% %muk ..muk ~
=+ ~(. fe 5)
- |= {syd/@ len/@ key/@}
- ?> &((lte (met 5 syd) 1) (lte (met 0 len) 31))
+ |= [syd=@ len=@ key=@]
+ =. syd (end 5 1 syd)
=/ pad (sub len (met 3 key))
=/ data (weld (rip 3 key) (reap pad 0))
=/ nblocks (div len 4) :: intentionally off-by-one
