Comment 4 for bug 404488

Values entered in GUI are clamped when grid is computed, there is no return to the GUI to say to the user that he is out of range.
I chose 0.05 because I first set 0 for min limit and saw that It was useless and after some tests, I concluded that 0.05 was the minimum usable value at a maximum zoom.

But you're right about the too many axes drawn when zooming out.