Why I can't set what parameters are mutable explicitly?

Offtopic
110

Exactly, for example:

julia> a = 1
1

julia> b = 2
2

julia> function foo(a,b)
       a = 2; b =3 ;
       end
foo (generic function with 1 method)

julia> foo(a,b)
3

julia> a
1

julia> b
2
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