erija952/blackjack — comment on commit d87f5ef713ab93fed724c63bbc3bf9233ab08a5a
File: src/deck.erl line 116
By daha:

one variant of this is to let the command return the state
another way is to give giv the gen_server the following list as the last argument [{debug, [trace]}]
or even better to activate to trace manually with:
sys:trace(Pid, true).