How do I format a JSR-385 Quantity with fixed number of decimal digits?

Question

I'm trying to convert hard-coded formatting to a Java Units API implementation.

The existing code outputs (for this example, the temperature value in degrees) with two decimal places. For example, 38.70°C. While I'd like to allow the user to specify their own formatting code (which is the end-goal of the change), I think it would be useful to keep the legacy behavior to give people a chance to migrate.

The existing code looks like:

        return String.format("%.2f\u00B0C", this.temperature);

The code I'm trying to use looks like:

        DecimalFormat numberFormat = (DecimalFormat) DecimalFormat.getInstance();
        numberFormat.setMinimumFractionDigits(2);
        numberFormat.setMaximumFractionDigits(2);
        NumberDelimiterQuantityFormat formatter =
                NumberDelimiterQuantityFormat.builder()
                        .setNumberFormat(numberFormat)
                        .setDelimiter("")
                        .setUnitFormat(SimpleUnitFormat.getInstance())
                        .build();
        return formatter.format(temperature);

It does format, but not with the specified precision. I'd expect 38.70°C but instead get 38.70000076293945℃.

If I just do

numberFormat.format(temperature.getValue().floatValue());

then it does format correctly ("38.70"). So I think the DecimalFormat is basically OK.

I considered just manually building my formatting. However that doesn't really work for what I want to do - pass in the NumberDelimiterQuantityFormat (or applicable interface).

Can anyone suggest an appropriate way to format a Quantity<> with fixed decimal precision?