Eliminate experimental feature (#3654)

Totally removes the `experimental` feature. Closes #3648.

---------

Co-authored-by: Bastian Köcher <git@kchr.de>

cumulus/pallets/collator-selection/Cargo.toml

@@ -77,5 +77,3 @@ try-runtime = [
 	"pallet-timestamp/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/pallets/collator-selection/src/mock.rs

@@ -125,7 +125,6 @@ impl pallet_aura::Config for Test {
 	type MaxAuthorities = ConstU32<100_000>;
 	type DisabledValidators = ();
 	type AllowMultipleBlocksPerSlot = ConstBool<false>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Self>;
 }
 

cumulus/parachains/runtimes/assets/asset-hub-rococo/Cargo.toml

@@ -251,8 +251,6 @@ std = [
 	"xcm/std",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 # A feature that should be enabled when the runtime should be built for on-chain
 # deployment. This will disable stuff that shouldn't be part of the on-chain wasm
 # to make it smaller, like logging for example.

cumulus/parachains/runtimes/assets/asset-hub-rococo/src/lib.rs

@@ -187,10 +187,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -723,7 +720,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/assets/asset-hub-westend/Cargo.toml

@@ -236,8 +236,6 @@ std = [
 	"xcm/std",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 # A feature that should be enabled when the runtime should be built for on-chain
 # deployment. This will disable stuff that shouldn't be part of the on-chain wasm
 # to make it smaller, like logging for example.

cumulus/parachains/runtimes/assets/asset-hub-westend/src/lib.rs

@@ -171,10 +171,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -703,7 +700,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/Cargo.toml

@@ -296,7 +296,6 @@ try-runtime = [
 	"sp-runtime/try-runtime",
 ]
 
-experimental = ["pallet-aura/experimental"]
 fast-runtime = []
 
 # A feature that should be enabled when the runtime should be built for on-chain

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/lib.rs

@@ -277,10 +277,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -445,7 +442,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-westend/Cargo.toml

@@ -246,8 +246,6 @@ try-runtime = [
 	"sp-runtime/try-runtime",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 # A feature that should be enabled when the runtime should be built for on-chain
 # deployment. This will disable stuff that shouldn't be part of the on-chain wasm
 # to make it smaller, like logging for example.

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-westend/src/lib.rs

@@ -251,10 +251,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -407,7 +404,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/collectives/collectives-westend/Cargo.toml

@@ -232,8 +232,6 @@ std = [
 	"xcm/std",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 # A feature that should be enabled when the runtime should be built for on-chain
 # deployment. This will disable stuff that shouldn't be part of the on-chain wasm
 # to make it smaller, like logging for example.

cumulus/parachains/runtimes/collectives/collectives-westend/src/lib.rs

@@ -184,10 +184,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -483,7 +480,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/contracts/contracts-rococo/Cargo.toml

@@ -196,8 +196,6 @@ try-runtime = [
 	"sp-runtime/try-runtime",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 # A feature that should be enabled when the runtime should be built for on-chain
 # deployment. This will disable stuff that shouldn't be part of the on-chain wasm
 # to make it smaller, like logging for example.

cumulus/parachains/runtimes/contracts/contracts-rococo/src/lib.rs

@@ -193,10 +193,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = pallet_timestamp::weights::SubstrateWeight<Runtime>;
 }
 
@@ -349,7 +346,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/coretime/coretime-rococo/Cargo.toml

@@ -194,6 +194,4 @@ try-runtime = [
 	"sp-runtime/try-runtime",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 fast-runtime = []

cumulus/parachains/runtimes/coretime/coretime-rococo/src/lib.rs

@@ -206,10 +206,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -369,7 +366,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/coretime/coretime-westend/Cargo.toml

@@ -190,6 +190,4 @@ try-runtime = [
 	"sp-runtime/try-runtime",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 fast-runtime = []

cumulus/parachains/runtimes/coretime/coretime-westend/src/lib.rs

@@ -206,10 +206,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -369,7 +366,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/glutton/glutton-westend/Cargo.toml

@@ -135,8 +135,6 @@ try-runtime = [
 	"sp-runtime/try-runtime",
 ]
 
-experimental = ["pallet-aura/experimental"]
-
 # A feature that should be enabled when the runtime should be built for on-chain
 # deployment. This will disable stuff that shouldn't be part of the on-chain wasm
 # to make it smaller, like logging for example.

cumulus/parachains/runtimes/glutton/glutton-westend/src/lib.rs

@@ -221,10 +221,7 @@ impl cumulus_pallet_aura_ext::Config for Runtime {}
 impl pallet_timestamp::Config for Runtime {
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -233,7 +230,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/people/people-rococo/Cargo.toml

@@ -188,5 +188,3 @@ try-runtime = [
 	"polkadot-runtime-common/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/parachains/runtimes/people/people-rococo/src/lib.rs

@@ -187,10 +187,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -337,7 +334,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/people/people-westend/Cargo.toml

@@ -188,5 +188,3 @@ try-runtime = [
 	"polkadot-runtime-common/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/parachains/runtimes/people/people-westend/src/lib.rs

@@ -187,10 +187,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -337,7 +334,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

cumulus/parachains/runtimes/starters/seedling/Cargo.toml

@@ -79,5 +79,3 @@ std = [
 	"sp-version/std",
 	"substrate-wasm-builder",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/parachains/runtimes/starters/seedling/src/lib.rs

@@ -213,17 +213,13 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<false>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Self>;
 }
 
 impl pallet_timestamp::Config for Runtime {
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ parachains_common::SLOT_DURATION / 2 }>;
 	type WeightInfo = ();
 }
 

cumulus/parachains/runtimes/starters/shell/Cargo.toml

@@ -99,5 +99,3 @@ try-runtime = [
 	"parachain-info/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/parachains/runtimes/starters/shell/src/lib.rs

@@ -241,17 +241,13 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<false>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Self>;
 }
 
 impl pallet_timestamp::Config for Runtime {
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ parachains_common::SLOT_DURATION / 2 }>;
 	type WeightInfo = ();
 }
 

cumulus/parachains/runtimes/testing/penpal/Cargo.toml

@@ -191,5 +191,3 @@ try-runtime = [
 	"polkadot-runtime-common/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/parachains/runtimes/testing/penpal/src/lib.rs

@@ -582,7 +582,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<false>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Self>;
 }
 

cumulus/parachains/runtimes/testing/rococo-parachain/Cargo.toml

@@ -134,5 +134,3 @@ runtime-benchmarks = [
 	"xcm-builder/runtime-benchmarks",
 	"xcm-executor/runtime-benchmarks",
 ]
-
-experimental = ["pallet-aura/experimental"]

cumulus/parachains/runtimes/testing/rococo-parachain/src/lib.rs

@@ -228,10 +228,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	#[cfg(feature = "experimental")]
 	type MinimumPeriod = ConstU64<0>;
-	#[cfg(not(feature = "experimental"))]
-	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = ();
 }
 
@@ -594,7 +591,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<true>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

docs/sdk/Cargo.toml

@@ -86,6 +86,3 @@ sp-version = { path = "../../substrate/primitives/version" }
 
 # XCM
 xcm = { package = "staging-xcm", path = "../../polkadot/xcm" }
-
-[features]
-experimental = ["pallet-aura/experimental"]

docs/sdk/src/polkadot_sdk/cumulus.rs

@@ -110,7 +110,6 @@ mod tests {
 				type DisabledValidators = ();
 				type MaxAuthorities = ConstU32<100_000>;
 				type AllowMultipleBlocksPerSlot = ConstBool<false>;
-				#[cfg(feature = "experimental")]
 				type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Self>;
 			}
 

prdoc/pr_3654.prdoc

@@ -0,0 +1,14 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Remove `experimental` feature from `pallet-aura`
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      The `experimental` feature in `pallet-aura`, previously used to gate different experimental
+      changes, became redundant with the introduction of the async backing which relies on the
+      mentioned changes, therefore, it is removed.
+
+crates:
+  - name: pallet-aura

substrate/frame/aura/src/lib.rs

@@ -66,9 +66,6 @@ const LOG_TARGET: &str = "runtime::aura";
 ///
 /// This was the default behavior of the Aura pallet and may be used for
 /// backwards compatibility.
-///
-/// Note that this type is likely not useful without the `experimental`
-/// feature.
 pub struct MinimumPeriodTimesTwo<T>(sp_std::marker::PhantomData<T>);
 
 impl<T: pallet_timestamp::Config> Get<T::Moment> for MinimumPeriodTimesTwo<T> {
@@ -117,10 +114,6 @@ pub mod pallet {
 		/// The effective value of this type should not change while the chain is running.
 		///
 		/// For backwards compatibility either use [`MinimumPeriodTimesTwo`] or a const.
-		///
-		/// This associated type is only present when compiled with the `experimental`
-		/// feature.
-		#[cfg(feature = "experimental")]
 		type SlotDuration: Get<<Self as pallet_timestamp::Config>::Moment>;
 	}
 
@@ -250,17 +243,7 @@ impl<T: Config> Pallet<T> {
 
 	/// Determine the Aura slot-duration based on the Timestamp module configuration.
 	pub fn slot_duration() -> T::Moment {
-		#[cfg(feature = "experimental")]
+		T::SlotDuration::get()
-		{
-			T::SlotDuration::get()
-		}
-
-		#[cfg(not(feature = "experimental"))]
-		{
-			// we double the minimum block-period so each author can always propose within
-			// the majority of its slot.
-			<T as pallet_timestamp::Config>::MinimumPeriod::get().saturating_mul(2u32.into())
-		}
 	}
 
 	/// Ensure the correctness of the state of this pallet.

substrate/frame/aura/src/mock.rs

@@ -84,8 +84,6 @@ impl pallet_aura::Config for Test {
 	type DisabledValidators = MockDisabledValidators;
 	type MaxAuthorities = ConstU32<10>;
 	type AllowMultipleBlocksPerSlot = AllowMultipleBlocksPerSlot;
-
-	#[cfg(feature = "experimental")]
 	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 

templates/parachain/runtime/Cargo.toml

@@ -194,5 +194,3 @@ try-runtime = [
 	"polkadot-runtime-common/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

templates/parachain/runtime/src/lib.rs

@@ -453,7 +453,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<100_000>;
 	type AllowMultipleBlocksPerSlot = ConstBool<false>;
-	#[cfg(feature = "experimental")]
 	type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Self>;
 }
 

templates/solochain/runtime/Cargo.toml

@@ -147,5 +147,3 @@ try-runtime = [
 	"pallet-transaction-payment/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-
-experimental = ["pallet-aura/experimental"]

templates/solochain/runtime/src/lib.rs

@@ -180,8 +180,6 @@ impl pallet_aura::Config for Runtime {
 	type DisabledValidators = ();
 	type MaxAuthorities = ConstU32<32>;
 	type AllowMultipleBlocksPerSlot = ConstBool<false>;
-
-	#[cfg(feature = "experimental")]
 	type SlotDuration = pallet_aura::MinimumPeriodTimesTwo<Runtime>;
 }