local -r for arrays

[Marco Ippolito]

I can do this:

g1() {
    local -r a=2$1
    echo "$a"
}

f1() {
    local -r a=1
    g1 "$a"
}

f1 -> "21"

but I can't do this:

g2() {
    local -r a=(2 "$@")
    echo "${a[@]}"
}

f2() {
    local -r a=(1)
    g2 "${a[@]}"
}

f2 -> error "a: readonly variable"

How does this "asymmetry" come about?