     ] if ;
 
 : random-ratio ( -- ratio )
-    1000000000 dup [ random ] 2apply 1+ / coin-flip [ neg ] when dup [ drop random-ratio ] unless 10% [ drop 0 ] when ;
+    1000000000 dup [ random ] 2apply 1+ / 50% [ neg ] when dup [ drop random-ratio ] unless 10% [ drop 0 ] when ;
 
 : random-float ( -- float )
-    coin-flip [ random-ratio ] [ special-floats random ] if
-    coin-flip 
-    [ .0000000000000000001 /f ] [ coin-flip [ .00000000000000001 * ] when ] if
+    50% [ random-ratio ] [ special-floats get random ] if
+    50%
+    [ .0000000000000000001 /f ] [ 50% [ .00000000000000001 * ] when ] if
     >float ;
 
 : random-number ( -- number )

USING: kernel math sequences namespaces errors hashtables words
arrays parser compiler syntax io tools prettyprint optimizer
inference ;
IN: random-tester

! Tweak me
: max-length 15 ; inline
: max-value 1000000000 ; inline

: 10% ( -- bool ) 10 random 8 > ;
: 20% ( -- bool ) 10 random 7 > ;
: 30% ( -- bool ) 10 random 6 > ;
: 40% ( -- bool ) 10 random 5 > ;
: 50% ( -- bool ) 10 random 4 > ;
: 60% ( -- bool ) 10 random 3 > ;
: 70% ( -- bool ) 10 random 2 > ;
: 80% ( -- bool ) 10 random 1 > ;
: 90% ( -- bool ) 10 random 0 > ;

! varying bit-length random number
: random-bits ( n -- int )

SYMBOL: special-integers
[ { -1 0 1 } % most-negative-fixnum , most-positive-fixnum , first-bignum , ] 
{ } make \ special-integers set-global
SYMBOL: special-floats
[ { 0.0 -0.0 } % e , pi , 1./0. , -1./0. , 0./0. , epsilon , epsilon neg , ]
{ } make \ special-floats set-global
SYMBOL: special-complexes
[ 
    { -1 0 1 C{ 0 1 } C{ 0 -1 } } %
    e , e neg , pi , pi neg ,
    0 pi rect> , 0 pi neg rect> , pi neg 0 rect> , pi pi rect> ,
    pi pi neg rect> , pi neg pi rect> , pi neg pi neg rect> ,
    e neg e neg rect> , e e rect> ,
] { } make \ special-complexes set-global

: random-fixnum ( -- fixnum )
    most-positive-fixnum random 1+ 50% [ neg 1- ] when >fixnum ;

: random-bignum ( -- bignum )
     400 random-bits first-bignum + 50% [ neg ] when ;
    
: random-integer ( -- n )
    50% [
        random-fixnum
    ] [
        50% [ random-bignum ] [ special-integers get random ] if
    ] if ;

: random-positive-integer ( -- int )
