Module cache 

Tile cache data structures: TileKey, CachedTile, TileCache, TilePrefetcher.

Implements an LRU tile cache with byte-budget eviction, staleness checking, FNV-1a ETag generation, and a prefetcher that enumerates neighboring tiles.

Structs

CacheStats

A snapshot of TileCache statistics.

CachedTile

A tile stored in the cache together with its metadata.

TileCache

LRU tile cache with entry-count and byte-budget eviction.

TileKey

Uniquely identifies a tile by zoom level, column, row, layer name, and format.

TilePrefetcher

Pre-fetches neighboring tiles based on the current access pattern.

Enums

TileEncoding

Content-encoding applied to the tile bytes.

TileFormat

The serialization format of a tile.