core/utils/seeded_random library

Classes

CompiledWeightedTable<T>: Pre-validates a weighted loot table ONCE at construction — compiling it into cumulative weights so repeated pick calls (e.g. every enemy spawn, every loot roll) don't re-validate and re-sum the whole table every time the way a bare weightedRandomPick call does.
RandomSnapshot: Opaque, versioned snapshot of a SeededRandom's internal state — serializable so a caller (e.g. a save file, or IDEA-42's replay capsule) can persist an RNG stream and later resume it at the exact point it left off, via SeededRandom.fromSnapshot.
SeededRandom: Deterministic, cross-platform-stable pseudo-random generator — implements Random so it's a drop-in source for weightedRandomPick, List.shuffle, or anywhere else a dart:math Random is accepted.
SeededRandomService: Manages independent, deterministically-derived SeededRandom streams keyed by a caller-chosen namespace (e.g. "loot", "enemy_spawn") — so one gameplay system calling its own stream an extra time never shifts another system's sequence, the classic shared-RNG replay-determinism trap.