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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"tell() is incorrect after read_bytes()","articleBody":"Using the default `._cmsgpack` implementation of an `Unpacker`, you will get the wrong answer if you call `tell()` after `read_bytes()`. Here's a simple repro:\r\n\r\n```\r\nimport msgpack\r\nfrom io import BytesIO\r\nbuf = BytesIO(b'my data')\r\nu = msgpack.Unpacker(buf)\r\nprint(u.tell())\r\nu.read_bytes(5)\r\nprint(u.tell())\r\n```\r\n\r\nAfter calling `u.read_bytes(5)`, `u.tell()` will still return 0. It looks like the `stream_offset` in `_unpacker.pyx` should be advanced in `read_bytes()`, but is currently only advanced by `_unpack()`.\r\n\r\nNote that this works correctly in the `.fallback` implementation, so a quick workaround is to use `import msgpack.fallback as msgpack`, but I assume this is much slower than the C implementation.","author":{"url":"https://github.com/eddyashton","@type":"Person","name":"eddyashton"},"datePublished":"2020-06-04T13:39:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/426/msgpack-python/issues/426"}