Constant DEFAULT_CACHE_STORE_BYTES 

pub const DEFAULT_CACHE_STORE_BYTES: u64 = _; // 67_108_864u64

Default MokaCache capacity (bytes, DW-037): the weigher counts key + value bytes plus a fixed per-entry overhead, so the bound is a real memory ceiling for the response cache (entries at or under the per-route max_body_bytes cap, of which 64 MiB holds hundreds).