pr_3654.prdoc

# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
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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