position_manager_permit2_single dispatches to the wrong permit overload

The function passes 5 arguments to self.position_manager.functions.permit(...): (owner, astuple(permit_single), spender, sig_deadline, signature). The PositionManager ABI only has two permit overloads — a 5-arg ERC721 permit (spender, tokenId, deadline, nonce, sig) and a 3-arg Permit2 single permit (owner, PermitSingle, signature). Web3.py will attempt to match the 5-arg call to the ERC721 overload, where the second argument is tokenId: uint256, but astuple(permit_single) is a tuple — ABI encoding will raise a TypeError at runtime. The spender and sig_deadline parameters are already encoded inside permit_single; the correct call is permit(owner, astuple(permit_single), signature) with 3 arguments.

Multi-hop exact-output quote passes the input token as exactCurrency

get_quote_exact_output is called with token0 (the input/selling token) as its first argument, but the Quoter contract's quoteExactOutput struct field is exactCurrency — the output token (the one being received). For a single-hop call, get_quote_exact_output_single handles ordering internally and is passed both tokens, so that path is fine. For multi-hop, however, token0 is passed where token1 should be, causing the quoter to report the cost of buying the wrong token. The correct call is self.get_quote_exact_output(token1, qty, route).