hikari.Bytes creates file with 0 bytes when proxing io.BytesIO

[Lunarmagpie]

Steps to reproduce

This code does not work.

def get_image() -> hikari.Bytes:
    img = Image.new(mode="RGBA", size=(500, 500))

    with io.BytesIO() as b:
        img.save(b, format="png")
        return hikari.Bytes(b, "file.png")

Expected result

The example function should post an image instead of an empty file.

Actual result

The first example function posts an empty file to discord.

System info

hikari (2.0.0.dev111) [2d0c77b5]
located at /foo/bar/venv/lib/python3.10/site-packages/hikari
CPython 3.10.6 GCC 11.3.0
Linux pop-os 6.0.3-76060003-generic #202210211149~1666452039~22.04~1891946 SMP PREEMPT_DYNAMIC Sat O x86_64 x86_64

Further info

This is how I solved the issue in my project:

def get_image() -> hikari.Bytes:
    img = Image.new(mode="RGBA", size=(500, 500))

    with io.BytesIO() as b:
        img.save(b, format="png")
        return hikari.Bytes(b.getvalue(), "file.png")

Checklist

• I have made sure to remove ANY sensitive information (bot token, passwords, credentials, personal details, etc.).
• I have searched the issue tracker and have made sure it's not a duplicate. If it is a follow up of another issue, I have specified it.

[davfsa]

Just for future reference, the bug was a missing b.seek(0) to re-set the pointer to the beginning before passing it to hikari

def get_image() -> hikari.Bytes:
    img = Image.new(mode="RGBA", size=(500, 500))

    with io.BytesIO() as b:
        img.save(b, format="png")
+       b.seek(0)
        return hikari.Bytes(b, "file.png")