It's funny the organizational rules that get written into a company's DNA. I could see a historical moment where Shopify, sans that invariant, massively fucked

It's funny the organizational rules that get written into a company's DNA. I could see a historical moment where Shopify, sans that invariant, massively fucked up inventory counts from uncompleted transactions... then had to unwind all that when a bunch failed to clear payment. Ergo, now there's an invariant.