auchy distribution around 0, with scale 1 (from @Statistics.Distribution.Cauchy@)
-- 
-- > λ> mwc $ listOf 10 cauchyStd
-- > [ 9.409701589649838,-7.361963972107541,0.168746305673769
-- > , 5.091825420838711,-0.326080163135388,-1.2989850787629456
-- > , -2.685658063444485,0.22671438734899435,-1.602349559644217e-2
-- > , -0.6476292643908057 ]
cauchyStd :: PrimMonad m
          => RandT m Double
cauchyStd = cauchy 0 1

-- | 
cauchyStd :: PrimMonad m
          => RandT m Double
cauchyStd = cauchy 0 1
cauchyStd = cauchy 0 1