m=1
readonly m=4
declare -p m

n=1
f() { readonly n=4; echo -n in func: ; declare -p n ; }
f
declare -p n

p=1
readonly p

readonly p=4
declare -p p

r=(1)
readonly r

f() { readonly r=(4) ; }
f
declare -p r

f() { readonly r='(5)' ; }
f
declare -p r

f() { readonly -a r=(6) ; }
f
declare -p r

f() { readonly -a r='(7)' ; }
f
declare -p r

x=(1)
readonly x=(4)
declare -p x

y=(1)
f() { readonly y=(4); echo -n in func: ; declare -p y; }
f
declare -p y

z=(1)
f() { readonly -a z=(4); echo -n in func: ; declare -p z; }
f
declare -p z

f() { readonly y1=(4); echo -n in func: ; declare -p y1; }
f
declare -p y1

f() { readonly -a z1=(4); echo -n in func: ; declare -p z1; }
f
declare -p z1