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Add comment above or in the godoc (channel state is open, if chain executed init; or flushing, if it executed try).

Return in `MsgChannelUpgradeInitResponse` only the upgrade version and the upgrade sequence.

In `ChanUpgradeTry` move fast forward sequence down below after the call to `ChanUpgradeInit`.

Move events to message server layer instead of core level.

Remove setting counterparty upgrade info in upgrade try

Emit an event when we move to `FLUSHCOMPLETE`

Call WriteUpgradeOpenChannel before calling application callback

Make sure that the error receipt we write always has a sequence greater than the existing one.

Remove incorrect code in TimeoutPacket

Remove `latestPacketSend` from `NewUpgrade` constructor

Pass the upgrade version returned by `OnChanUpgradeInit` to `WriteUpgradeInitChannel` instead of updating `upgrade.Fields.Version` in the message server.

Panic in `WriteErrorReceipt` instead of returning an error

Add comment in `ChanUpgradeInit` that a nil timeout is intentionally returned

Change the error returned (`ErrChannelExists`) in `validateSelfUpgradeFields` when the proposed upgrade fields match the channel current parameters

Godoc of `validateSelfUpgradeFields` needs to be updated (order doesn’t need to be a subset)

Items from channel upgradability alpha walkthrough

Add custom query support to `wasm` module

Workflow does not fail even if exit code 1

Docs: Information on connection delay parameter

Write e2e tests for channel upgradability

Add list of allowed packet data keys to `Allocation` of `TransferAuthorization`

Add attribute `header_hash` to update client event

Docs improvements - clarification of channel closure

Use `StoreCodeUnchecked` instead of `StoreCode` in snapshotter/init genesis.

Remove contracts stored in test_data

Switch `QueryChannelUpgradeProof` test helper to query the target endpoint rather than its counterparty

Implement OnChanUpgradeAck on Controller Chain for interchain-accounts

Implement OnChanUpgradeTry on Host Chain for interchain-accounts

Implement OnChanUpgradeInit on Controller Chain for interchain-accounts

Add diagram to overview documentation