bitcoin-cli getbalance "*" 0
0.12820000
bitcoin-cli getbalance "" 0
0.12830000
The * gives less results than "". I guess that's a bug.
Also weird:
bitcoin-cli getbalance
0.12820000
bitcoin-cli getbalance '*' 1
0.12810000
When you would expect those two commands are identical. (probably due to unconfirmed change)