ErikZalm/Marlin — pull request #1282 by vandarin (2014-12-31 18:38:36+00:00)
Title: Due to the fix for #1248, X and Y probe offsets must not be floats.

The compiler does not support comparing float values: "error: floating constant in preprocessor expression"
The loss in X/Y precision won't matter for Z probes, as most microswitches or inductive sensors are larger than 1mm square anyway.