Actually, arrays cannot be undefined, just made empty (same with hashes). If you try undef @array in the debugger and then dump its value using the 'x' command, the effect is the same as if you had said @array = (), namely 'empty array'. (The same may be said for hashes, which under the above circumstances, produce the message, 'empty hash').
Only scalars may be truly undefined; undef is itself merely a value, albeit a special one. As a C/C++ programmer, I rather think of scalars analagous to pointers -- sort of "auto-allocating, auto-dereferencing, type-ambivalent pointers", but pointers nonetheless, with undef rather analagous to NULL.
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