When defining a stroke width, Affinity Designer (and Publisher) currently converts decimals more than one place to tenths.
It is important to have the ability to specify decimals in the stroke width of a line up to four decimal places so that the software can be used to define vector cut lines in laser engraving software.
Case in point - the users manual for Trotec Job Control states that for vector lines to cut with a laser, you must set them at a width of "0.001 mm or 0.00005 inches" (see attached screenshot).
You currently cannot do that with Affinity Designer/Publisher, if you type in a width of "0.0036pt" (equal to 0.00005 inches) as the stroke width, the software will convert 0.0036 to zero. Actually anything less than 0.1 will get rounded down to zero.
This is important functionality if we were to completely replace Illustrator & InDesign.