Function croaring_sys::roaring64_bitmap_portable_size_in_bytes

pub unsafe extern "C" fn roaring64_bitmap_portable_size_in_bytes(
    r: *const roaring64_bitmap_t
) -> usize

How many bytes are required to serialize this bitmap.

This is meant to be compatible with other languages: https://github.com/RoaringBitmap/RoaringFormatSpec#extension-for-64-bit-implementations