I've been looking around on the internet (as well as in all the Blender settings) for solution, but nothing came up.
For whatever reason, since some recent point in time all the edge lengths in Blender show up in exponential form if they exceed 100 (i.e. 100 already becomes 1e+002).
Not only this is somewhat inconvenient to read, it also turns out to be imprecise, as smaller numbers are not represented in mantissa (1000 is shown as 1e+003, 1007 is also shown as 1e+003). Is there some hidden switch for this mode, or logic by which Blender selects it?