LESSON 15 - UnitTest: Question about getProceeds(deployer)

[DorianDaSilva]

The terminal was returning several errors for it("lists and be bought") and the root cause was pinpointed to this funtion.

const deployerProceeds = await nftMarketplace.getProceeds(deployer)

I modified it to the one below and the test passes

const deployerProceeds = await nftMarketplace.getProceeds(deployer.address)

My question is "how come the repo and video only use deployer as an argument and I had to modify it to deployer.address for it to run? And, is this correct or does it alter the functions of the test?