echo $(( 0x7e ))
echo $(( 0x7f ))
echo $(( 0x80 ))

a=$'\x80'
recho "$a"

a=( $'\x7e' $'\x7f' $'\x80' )

recho "${a[@]}"

unset a
a[0]=$'\x7e'
a[1]=$'\x7f'
a[2]=$'\x80'

recho "${a[@]}"

b1=$'\x7e'
b2=$'\x7f'
b3=$'\x80'

unset a
a=( "$b1" "$b2" "$b3" )

recho "${a[@]}"