Thanks for the help ikegami.

I am thinking to submit a bug report on the documentation with the following suggestion for an addition:

Hash keys are always strings. Hash subscripts that are not strings
are converted to strings before being used as keys.

A subscript may be a string, simple bareword, list, array
or expression.

A string is used as-is.

A bareword is treated as if it were a quoted string.

A list is joined with the subscript separator C<$;> (see L<perlvar>).
Note that it is not joined with the list separator C<$">, as it would
be if it were being interpolated into a double quoted string.
The following are equivalent:

    $hash{'a', 'b', 'c'} = 1;
    $hash{join($;, 'a', 'b', 'c')} = 1;

Arrays are evaluated in scalar contex and the result is
converted to a string. Note the difference between an
array and a list, but also that an array can be 
interpolated into a list. Alternatively, an array can
be interpolated into a double quoted string. In the
following, 1 and 2 are the same, as are 3 and 4,
as are 5 and 6.

    @array = ('a', 'b', 'c');
    $hash{@array} = 1;                  # 1
    $hash{'3'} = 1;                     # 2
    $hash{(),@array} = 2;               # 3
    $hash{join($;, @array)} = 2;        # 4
    $hash{"@array"} = 3;                # 5
    $hash{join($",@array)} = 3;         # 6

Everything else is evaluated as an expression and the result is
converted to a string. Note that while references can be used
as hash subscripts and are easily converted to string representation
it is not easy to convert the string representation back to a
reference. Note also that array slices are handled differently
than either lists or arrays. They are processed like lists are
in other contexts and yield the last element of the slice.
[download]

Any suggestions before it goes to bother those busy people would be much appreciated.

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