Constant Detail Blender 2.78 VS Constant Detail Blender 2.79

Constant Detail Blender 2.78 VS Constant Detail Blender 2.79In version 2.78 when we change to Constant Detail we have Detail Size in percentage and in version 2.79 we have resolution, and we have in them the icon of the pipette. What this item in Dyntopo turns out to have changed from 2.78 to 2.79 in that respect. Because before it was Detail Size in percentage and changed to Resolution.
How to understand this?