    @is_prefix(s1:string, s2:string)
    @is_prefix(s1:string, s2:string, cmp:fct)
    @is_prefix(t1:tab, t2:tab)
    @is_prefix(t1:tab, t2:tab, cmp:fct)

@is_prefix is an overloaded function. See also @is_suffix and @is_subsequence.

    @is_prefix(s1:string, s2:string)

returs true if string `s1`is a prefix of `s2`.

    @is_prefix(s1:string, s2:string, cmp:fct)

the predicate returns true if `s1` is a prefix of `s2` where the characters are compared with the function `cmp` (taking two arguments). The characters are passed to the function `cmp` as strings of length one.

    @is_prefix(t1:tab, t2:tab)

the predicate returns true if `t1` is a prefix of `t2`, that is, if the elements of `t1` are the initial elements of `t2`.

    @is_prefix(t1:tab, t2:tab, cmp:fct)

same as the previous version but the function is used to test the equality between the elements, instead of the usual comparison between values. For example:

           @fun_def cmp($x, $y) { $x > $y }
           @is_prefix([11, 22], [5, 6, 7], @cmp) -> true

`true` is returned because `@cmp(11, 6)` and `@cmp(22, 7)` hold.

See also predicates: @!=, @&&, @||, @<=, @<, @==, @>=, @>, @approx, @arch_darwin, @arch_linux, @arch_windows, @between, @empty, @find, @is_bool, @is_defined, @is_exec, @is_fct, @is_float, @is_function, @is_int, @is_integer_indexed, @is_list, @is_map, @is_nim, @is_numeric, @is_obj, @is_obj_xxx, @is_prefix, @is_string, @is_subsequence, @is_suffix, @is_symbol, @is_undef, @is_vector, @member, @occurs

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