Bourne Shell Can't Use Arrays?

[shanenin]

I was reading in my book that the bourne shell, sh, only supports scalar varaible, not arrays. I would expect the following to fail, but it works well

#!/bin/sh
VAR=(aaa bbb)
echo ${VAR[1]}

isn't the above code a array variable, if so it should not work?

[shanenin]

I found this explanation. Only where bash and POSIX sh are incompatible, will /bin/bash interperet the code in a strict POSIX sh manner. That would explain why #!/bin/sh would run the code above.