You can also do it this way:
Place this function in your transform directory:
//round1.js
(function(i) {
var input = parseFloat(i);
var output = input.toFixed(1);
return output;
})(input)
Then choose the Script ECMAScript profile:
It also gives you the correct rounding in the log:
Item 'astroAzimut' changed from 125.94 ° to 125.9 °
