More work. Too many changes to be listed.

unittests/array_test.c

@@ -0,0 +1,17 @@
+#include "unit.h"
+#include <dst/dst.h>
+
+int main() {
+    int64_t i;
+    DstArray *array = dst_array(10);
+    assert(array->capacity == 10);
+    assert(array->count == 0);
+    for (i = 0; i < 500; ++i)
+        dst_array_push(array, dst_wrap_integer(i));
+    for (i = 0; i < 500; ++i)
+        assert(array->data[i].type == DST_INTEGER && array->data[i].as.integer == i);
+    for (i = 0; i < 200; ++i)
+        dst_array_pop(array);
+    assert(array->count == 300);
+    return 0;
+}