Client-side initial sharding configuration
Kiscord should spawn all recommended shards
Base class for custom sharding strategies
Kiscord should spawn one (and only one) shard
Kiscord should spawn all totalShards shards
Predicate that should allow or forbid to spawn specified shard (called totalShards times)
Total shards count that designates to connect to the gateway, or null if gateway default should be used
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