3.32 Out-of-range Enum

Older versions of Solidity produced unexpected behavior with out-of-range enums. For example we had enum E{a} (with a single member a) as shown here, then E(1) is out-of-range because, remember, indexing of enum members begins with 0.

So E(1) here is out-of-range because there's a single mapper. This out-of-range enum produced unexpected behavior in Solidity < 0.4.5. This was due to a compiler bug which has since been fixed.

The best practice until the fix was applied was to check the use of enums to make sure they are not out-of-range.