That's what Taulmarill meant.

Basically: an "empty" array can have any size, but an empty list always has size 0.

UPDATE: that should show it...

  DB<1> @a[3..5]=()
 
  DB<2> @b[3..5]=()
 
  DB<3> print scalar @a
6
  DB<4> print ( () = @a,@b )
 
  DB<5> @c= @a,@b
 
  DB<6> print scalar @c
6
  DB<7> @c=(@a,@b)
 
  DB<8> print scalar @c
12  
  DB<9> print ( () = (@a,@b) )
 
  DB<10> push @a,@b
 
  DB<11> print scalar @a
12
  DB<12> x @a
0  undef
1  undef
2  undef
3  undef
4  undef
5  undef
6  undef
7  undef
8  undef
9  undef
10  undef
11  undef
[download]

Line 12 clearly shows, that concatenating two "empty" arrays leads to a larger "empty" array...

Anyway the difference between line 5 and 7 is somehow surprising ...

UPDATE: Aaaaaargh!!! 8)

In line 5, I fell into the scalar comma operator trap again ... it's basically (@c=@a),(@b)

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