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Finds and returns the object in nested objects that is specified by index and identifiers. The nested objects may be instances of various classes. See Dig Methods.
a = [:foo, [:bar, :baz, [:bat, :bam]]]
a.dig(1) # => [:bar, :baz, [:bat, :bam]]
a.dig(1, 2) # => [:bat, :bam]
a.dig(1, 2, 0) # => :bat
a.dig(1, 2, 3) # => nil
               static VALUE
rb_ary_dig(int argc, VALUE *argv, VALUE self)
    rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
    self = rb_ary_at(self, *argv);
    if (!--argc) return self;
    return rb_obj_dig(argc, argv, self, Qnil);

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