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foo is nil? false false
foo: len=4 cap=4 data: 1 2 4 5
bar: len=3 cap=5 data: 0 0 0
foo[1:2]: len=1 cap=3 data: 2
sum foo: 12
copy foo -> bar: 3
bar: len=3 cap=5 data: 1 2 4
slice is nil? true true
grow: len=0 cap=0 data:
grow: len=1 cap=1 data: 42
grow: len=3 cap=4 data: 42 -1 -2
grow: len=7 cap=8 data: 42 -1 -2 1 2 4 5
grow: len=7 cap=8 data: 42 -1 -2 1 2 4 5
grow: len=14 cap=16 data: 42 -1 -2 1 2 4 5 42 -1 -2 1 2 4 5
bytes: len=6 cap=6 data: 1 2 3 102 111 111
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