Add a couple of array types

[greenfork]

Here is some code I used to parse arrays. It is not complete and it is a good candidate to be moved to C when it is stable enough. All array types are not covered and could require further adjustments.

It has a bug that a value in the array with comma like this one {"A, B"} will fail to be parsed. In order to fix it, it requires a proper parser. It returns nil in case of scan-number and raises an exception in other cases, so technically there's no mis-parsing.

See for yourself if you'd like to accept this code given this downside.