Suggestion : disable transfering tokens between same token accounts

[Nagaprasadvr]

Its a little bit confusing that we can transfer spl tokens between same token accounts (src and dest is the same)
Better to add a check and throw an error

[chudleigh2]

I actually find the ability to send to the same account quite useful. With a limited amount of Devnet tokens available, it is often useful to send them back to the source account to be reused.

You can continually test a program without running out (well - you would run out eventually but it would take a long time)

[joncinque]

Thanks for coming forward with a suggestion! The self-transfer behavior is very much a desired feature, so I wouldn't make the change. Either way, I'll leave the issue open in case anyone else wants to chime in.