Constant MAX_PLAUSIBLE_OBJECT_SIZE 

pub const MAX_PLAUSIBLE_OBJECT_SIZE: u64 = _; // 281_474_976_710_656u64

Upper bound on a plausible cached object size. No micromegas lake object (parquet partition or blob) approaches this; a decoded size above it means a corrupt/misdecoded cache entry, which is treated as a miss and re-resolved from origin rather than driving a catastrophic allocation (#1287).