> > Well, they are considered "declared", but that's the extent of it.

Nope, e.g. $% is a special var which is global, @% isn't documented anywhere, but still global

    
  DB<1> x @%=1..3
0  1
1  2
2  3

  DB<2> x {package A; @%}
0  1
1  2
2  3

  DB<3> x @a=1..3  # not global
0  1
1  2
2  3

  DB<4> x {package A; @a}
  empty array

  DB<5>
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