`take_from_bytes_cobs` not consuming trailing null bytes inserted by `to_slice_cobs`

[DusterTheFirst]

take_from_bytes_cobs returns two things on success. The de-serialized structure and any leftover buffer. When de-serializing using take_from_bytes_cobs it would make sense for the trailing null byte to be consumed by the de-serialization since it is somewhat part of the data. It also is unintuitive that the user will end up with a buffer with a single null byte after de-serializing cobs data.

My specific use case is as follows:
Calling postcard::to_slice_cobs on my data returns [2, 1, 0] and calling postcard::take_from_bytes_cobs returns (<my data>, &[0])

[jamesmunns]

Hey @DusterTheFirst, thanks for reporting this! I managed to track down the issue. take_from_bytes_cobs was returning the number of DECODED bytes, not the number of SOURCE BYTES used during decoding.

This was... very wrong, and not a useful number.

Thanks again!