declare -A assoc=(hello world "key with spaces" "value with spaces" one 1 foo bar)
declare -p assoc

recho "${assoc[@]}"
recho "${assoc[@]@k}"

recho "${assoc[*]}"
recho "${assoc[*]@k}"

set -- hello world "key with spaces" "value with spaces" one 1 foo bar
recho "${@}"
recho "${@@K}"
recho "${@@k}"

declare -A clone
eval clone=\( "${assoc[@]@K}" \)
declare -p clone

declare -A posparams
eval posparams=\( "${@@K}" \)
declare -p posparams