Whisper works surprisingly well with numbers. I can say numbers, both integer and with decimal points, and get fairly accurate results, but it doesn't do negative numbers. I tried using "minus" and "negative" prefixes, but whisper just returns those words. I can fairly easily fix this with a little post processing, but am I missing something here? Here's an example:

It seems like Whisper must be doing something special with "point", because all of the numbers above, including the ones with decimal places, were correctly interpreting the word "point" I used to inject the decimal point.