pub fn fuzz_groupby_sum_bytes(input: &[u8]) -> Result<(), String>Expand description
Structure-aware fuzz entrypoint for groupby_sum() invariants.
The first byte selects dropna; remaining bytes are split at | (or
midpoint) into key/value series payloads. The harness projects these into
bounded Int64-or-null keys plus numeric-or-missing values, then requires the
global, arena, and forced-fallback execution paths to agree exactly.