Great kata! The only minor issue I encountered was mis-casing of dateOfbirth property (proper camelCase would be dateOfBirth).

yes, I've removed all rounding hacks and all tests are passing now

My random tests keep failing because of some strange rounding issues:

1. amounts in the raw object seem to be rounded to 1 decimal point - I could round the result in the same way, but it seems pointless and hacky
2. time value doesn't match the test by a 0.0000000000001 - and I can't event hack this diff to pass tests (most of the runs, it's the expected result that is not rounded)

I might guess it's because random tests can request a non-integer number of portions (amount % yield !== 0).
Or am I missing anything in the algorithm?