Hello,
var='!hello world'; setopt shwordsplit; [[ ${${var}[1]} != '!' ]] && print
No exclamation mark detected

Output: No exclamation mark detected

local -A hsh=( key '!hello world' ); setopt shwordsplit; [[
${${hsh[key]}[1]} != '!' ]] && print No exclamation mark detected

Output: No exclamation mark detected

local -a arr=( '!hello world' ); setopt shwordsplit; [[ ${${arr[1]}[1]} !=
'!' ]] && print No exclamation mark detected

Output: No exclamation mark detected

Question: doesn't using [[ mean that the arguments are quoted ->
shwordsplit is inactive?

-- 
Sebastian Gniazdowski
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