RPC account_nextIndex name is confusing

[xlc]

We have RPC system_accountNextIndex / account_nextIndex, but the method is returning nonce.

substrate/utils/frame/rpc/system/src/lib.rs

Lines 57 to 58 in 510e68b

	#[rpc(name = "system_accountNextIndex", alias("account_nextIndex"))]
	fn nonce(&self, account: AccountId) -> FutureResult<Index>;

And we have another AccountIndex

substrate/bin/node/primitives/src/lib.rs

Lines 38 to 39 in 510e68b

	/// The type for looking up accounts. We don't expect more than 4 billion of them.
	pub type AccountIndex = u32;

IMO account_nextIndex means give me the next AccountIndex, not the next account nonce.

Feel free to close this if I am the only one found this confusing.

[bkchr]

So you mean it should be renamed to system_accountNextNonce?

[xlc]

Yes that's a better name to me.

[jaxter03]

@bkchr can I pick this?

[bkchr]

You can do this if you want. Make sure the old rpc name is still available.