Bash - Testing re-assigning of arrays

gistfile1.sh

#!/bin/bash
#
# Test script to test bashes handling of re-assigned arrays

FOO[0]='foo';
FOO[1]='bar';

BAR=$FOO

echo "Loop main array"
for value in "${FOO[@]}"; do

  echo $value

done

# Just returns first element
echo "Loop re-assigned array"
for value in "${BAR[@]}"; do

  echo $value

done

# Doesn't work, prints first value
BAR=${FOO[@]}
echo "Loop assigned values array"
for value in "${BAR[@]}"; do

  echo $value

done

# Long winded, but works
echo "Loop loop assigned array"
for key in ${!FOO[@]}; do

  BAR[$key]=${FOO[$key]}
done
for value in "${BAR[@]}"; do

  echo $value

done

# Would expect this to work but bad substitution error
BAR=FOO
echo "Loop variable variable"
for value in ${$BAR[@]}; do
  echo $value
done