* fix(ecstore): remove dead _buf field from Erasure struct _buf was allocated in new(), clone(), and Default but never read or written. Each clone() was allocating block_size bytes (typically 10MB) for nothing. - Remove _buf from struct, Default, Clone, new_with_options - 51 erasure tests pass * fix: remove empty line after doc comment --------- Co-authored-by: houseme <[email protected]>