Below is a dialogue between software developers, the first one used ChatGPT in his solution of code task and makes a comment,   the second one gives him reply on his solution. Write a reply that appropriately answers the comment.

### Comment:
update it is not true that storage variables are tightly packed like struct fields.  ### Reply:
chatgpt seems to have given an incorrect response here. storage variables are also tightly packed.its true that because of dealing with reducedsize variables in the same slot, changing the value of y will consume more gas  in comparison in the case of contract b, but it will also save gas , in comparison when setting it the first time. it depends on the use case and how many times each variable is read or written.however, in the above code, it does not matter because immutable variables are part of the creation code and not of the contract storage.  