Module buffer 

Arrow-style nullable buffer: contiguous values + validity bitmap.

Replaces Vec<Option<T>> with a separate bitmap for NA tracking. Memory: 8 bytes per f64 + 1 bit per element (vs 16 bytes per Option<f64>).

Structs

BitVec

Compact bit vector stored as packed u64 words.

NullableBuffer

A contiguous buffer of values with a separate validity bitmap for NA tracking.

NullableIntoIter

Owned iterator over NullableBuffer yielding Option<T>.

NullableIter

Iterator over NullableBuffer yielding Option<&T>.