open

Bulk-open every cached entry whose CacheEntry.dataType matches category. Return type follows the category's phantom witness:

val tiles:     List<TiledImageLayer>        = cm.open(CacheCategory.Tiles)
val mvt:       List<VectorLayer>            = cm.open(CacheCategory.VectorTiles)
val features:  List<VectorLayer>            = cm.open(CacheCategory.Features)
val coverages: List<TiledElevationCoverage> = cm.open(CacheCategory.Coverage)

Entries the dispatcher can't materialize (missing service info, no registered opener, type cast mismatch) are silently dropped — the return list contains only successfully reconstructed objects.

For per-key opens use openLayer / openElevationCoverage; for narrower-than-category filtering (e.g. WMS only) chain .filterIsInstance<WmsImageLayer>() on the result.