Idea: Combine array and array elements allocations

[TysonAndre]

e.g. use malloc and the c struct hack to improve array locality, add sizeof(T) * new_size to the realloc call

struct array {
    uint32_t nelem;  /* # element */
    size_t   size;   /* element size */
    uint32_t nalloc; /* # allocated element */
    void     *elem[0];  /* element */
};