This proposal aims to enable pre-checking for runtime upgrade on parachains: With pre-checking enabled a parachain is only allowed to upgrade their runtime **after validators have tried compiling it and they agree it is good**, as opposed to just accepting it blindly and then fail when the parachain tries to produce blocks with the new runtime. This is just generally a good idea, exists for a while already and has been successfully tested on Versi, Rococo and Westend. It is also required for rolling out slashing as it helps reducing the risk of unjustified slashes.

Parachains need to support the `go_ahead_signal,` but that should be a non issue as this has been introduced over a year ago.

 - Call to be enacted: [HERE](https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.dotters.network%2Fpolkadot#/extrinsics/decode/0x332901).

Preimage is submitted. Make sure to review and vote at your convenience!

Schedule the currently externally-proposed majority-carries referendum to be tabled
immediately. If there is no externally-proposed referendum currently, or if there is one
but it is not a majority-carries referendum then it fails.

The dispatch of this call must be `FastTrackOrigin`.

- `proposal_hash`: The hash of the current external proposal.
- `voting_period`: The period that is allowed for voting on this proposal. Increased to
	Must be always greater than zero.
	For `FastTrackOrigin` must be equal or greater than `FastTrackVotingPeriod`.
- `delay`: The number of block after voting has ended in approval and this should be
  enacted. This doesn't have a minimum amount.

Emits `Started`.

Weight: `O(1)`

Enable or disable PVF pre-checking. Consult the field documentation prior executing.

- This proposal is about allowing parachains to upgrade their runtime after validators have checked it.
- It has been successfully tested on different platforms.
- It is important for reducing the risk of unjustified slashes.
- Parachains need to support a specific signal, but that shouldn't be a problem.
- There is a call to be enacted and a preimage has been submitted.

#77 Setting pvfCheckingEnabled In The Configuration To TRUE

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