Support Uint8Arrays

[nicolo-ribaudo]

Node's fs accepts both Buffers and Uint8Arrays.

(example: https://nodejs.org/api/fs.html#fs_fs_write_fd_buffer_offset_length_position_callback)

This library doesn't work with typed arrays because it sometimes uses Buffer#copy, which doesn't exist on Uint8Arrays.

---

Current workaround:

Uint8Array.prototype.copy = function copy(...args) {
    return Buffer.from(this.buffer).copy(...args);
};