b-tree

Hey thanks for the library. Is there any possibility for a C version of this? Then it would be much easier to embed in other languages. A C-wrapper would also be a good compromise.

Many times when reading data from disk, we read a length and immediately ask the OS to ensure a Vec can hold that much data, potentially resizing the Vec.

If there is an issue with the data on-disk, this could lead to attempting to allocate too much data. The subsequent read call will fail due to an EOF, if the allocation succeeds.

Before requesting a resize or reservation, we should check t