Bigloo Scheme - simple type conversion

For a long time I looked for a function real->integer, it turned out that everything is much more easy.

1:=> (integer? 6.0)
#t
1:=> (real? 6.0)
#t
1:=> (exact? 6.0)
#f
1:=> (inexact? 6.0)
#t
1:=> (vector-ref (make-vector 10 0) 6.0)
*** ERROR:_vector-ref:
Type `int' expected, `real' provided -- 6.0
    0.interp
    1.engine
    2.main
1:=> (vector-ref (make-vector 10 0) 6)
0
1:=> (vector-ref (make-vector 10 0) (inexact->exact 6.0))
0