For RPC methods which accept options parameters ((importmulti, listunspent, fundrawtransaction, bumpfee, send, sendall, walletcreatefundedpsbt, simulaterawtransaction), it is now possible to pass the options as named parameters without the need for a nested object. (#26485)
This means it is possible make calls like:
src/bitcoin-cli -named bumpfee txid fee_rate=100instead of
src/bitcoin-cli -named bumpfee txid options='{"fee_rate": 100}'