Function split_lines 

pub fn split_lines(payload: &[u8]) -> Vec<&[u8]>

Available on (crate features worker-pool or worker-batch or worker) and crate feature worker-batch only.

Split an NDJSON payload into individual line slices.

Handles \n, \r\n, trailing newlines, and blank lines (skipped). Zero-copy – returns slices into the original payload.