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foo[0]=a
foo[1]=b
[[ -v foo[1] ]] && echo foo index 1: ok
[[ -v foo[2] ]] || echo foo index 2: ok
[[ -v foo ]] && echo foo: implicit reference to element 0: ok
typeset -i foo
[[ -v foo[1] ]] && echo foo: arithmetic evaluation: ok
typeset -a bar
bar[1]=set
[[ -v bar ]] || echo bar: array with element zero unset: ok
[[ -v bar[0] ]] || echo bar: element zero: ok
typeset -a qux
[[ -v qux ]] || echo qux: unset array: ok
[[ -v qux[0] ]] || echo qux: unset array element 0: ok
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