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+## Use `[[ ]]` or quote arguments to -v to avoid glob expansion.
+
+### Problematic code:
+
+```sh
+[ -v foo[0] ] 
+```
+
+### Correct code:
+
+```sh
+[ -v 'foo[0]' ]
+```
+### Rationale:
+
+With `[`, arguments will undergo glob expansion. If a file `foo0` exists when the problematic code is run, it will check for the variable `foo0` instead of the array entry `foo[0]`. If there additionally exists a `foo1`, it will simply fail with an error.
+
+Use `[[ ]]` or quote the argument.
+
+### Exceptions:
+
+None.
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