make _arr, _hsh, _str wrapper functions
String#scan
fix _hsh
_str.to_i
_str.dump, move coercion to _str for _str.index
_str.to_f
_coerce throws type error if passed null
delegate some ducktyping to valueOf
return enumerators when not passing blocks
_arr.each_index, _arr.fill
more _arr methods
optimize calling lite from rubyjs