Pitfalls/traps in coding legislation

[nikhilwoodruff]

Just starting this thread to add to as they occur to me (feel free to add to):

• Be careful about using iterators to efficiently use parameters: e.g. list_of_four_things = [bracket.rate for bracket in parameters.tax.main.brackets] (which then goes on to use the list in some way that works assuming the list has exactly four members) will work in the baseline, but fail if a reform adds an extra tax bracket.