[racket] vector-map! works on immutable vectors

[Calin Dumitrescu]

Is this a bug?

Welcome to Racket v6.0.
> (define v #(1 2 3))
> v
'#(1 2 3)
> (immutable? v)
#t
> (vector-map! add1 v)
'#(2 3 4)
> v
'#(2 3 4)
> (immutable? v)
#t

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