pub unsafe extern "C" fn zvec_doc_serialize(
doc: *const zvec_doc_t,
data: *mut *mut u8,
size: *mut usize,
) -> zvec_error_code_tpub unsafe extern "C" fn zvec_doc_serialize(
doc: *const zvec_doc_t,
data: *mut *mut u8,
size: *mut usize,
) -> zvec_error_code_t