Axis with fixed domain range without rounding

I am using .chartYScale(domain: 0...12) to define a Y axis from 0 to 12, but the chart will always display 0 to 15, i.e. it will round the given values up to the next "nice one". However, I don't want this in my use case. How do I tell the chart to use exactly the provided range and don't adjust it automatically?