Packing balance and accruedSince in the same slot about ubi HOT 2 OPEN

struct UbiStream {
  address to;
  uint32 streamAmount;
}

struct UbiAccount {
  uint152 balance;
  uint32 accruedSince; // timestamp of last redeem
  uint32 accrualPerSecond; // if you're not a human, you can still be streamed ubi.
  bool isHuman; // allows to NOT require a poh check on transfer, which saves 2600 gas.
  // when the third party disables the isHuman and streams, it gets all the UBI the human didn't redeem.
  // even the UBI that is streamed to the disabled human (for technical reasons).
  uint32 streamedToOthers; // sum of ubi that this human is streaming to others.
  Stream[] streamsTo; // purposely not a mapping. allows a third party to disable the streams
  // on everyone that has been awarded an ubi stream from this party.
  // (should be slightly cheap since this array will be set to zero as it iterates, refunding gas)
}

struct UbiAccount {
  uint176 balance;
  uint32 accruedSince; // timestamp of last redeem.
  uint32 nStreams; // counts how many ubi streams are pointing at you.
  bool isHuman; // allows to NOT require a poh check on transfer, which saves 2600 gas.
  // when a third party disables the isHuman, it gets all the accrued UBI of one stream.
  // but the UBI that was streamed from other to this human will stay in the human.
  bool streamingToOther; // makes transfer cheaper, otherwise you'd have to SLOAD the "streamsTo"
  // address of this struct, that lives in another slot.
  // --- 2nd slot ---
  address streamsTo; // if streamingToOther, a whole human stream is awarded to this address.
  uint96 freespace;
}