[Truffle] Reimplement slow version of Array#pack.
[Truffle] Keep conversion to JRuby in the context rather than individual classes.
[Truffle] Reimplement Array#slice.
[Truffle] Reimplement Array#each_with_index.
[Truffle] Fix Array#each_with_index - index comes second.
[Truffle] Reimplement Array#min.
[Truffle] Array#[] where we need to re-type the store.
[Truffle] Use JRuby's implementation of String#inspect.
[Truffle] Fix some String mistakes.
[Truffle] Add an informative panic method.
[Truffle] Don't be so keen to convert an array to Object[] just because we've moved down the DAG.