This is a tiny and simple library to work with cash flows. I'm actually learning about cash flows, what means the whole repository is just an experiment. =]
I also would say if you like property tests, magic methods and etc, you will like of some experiments here...
(FIXME): [What I undertand as] A cash flow is a list of transactions. For this moment, I don't need to know what the context of these transactions (e.g. product, company, etc).
(FIXME): A transaction is a register of an operation. This register has a value and a timestamp. Under the hood, it also has metadata attached (e.g. uuid or something else related to the context)