drab wrote:I never got an official answer to this question, but I have since deduced that it must mean "the end".
Sorry for the late reply.
Trailing underscores in display indicate underflow. That is, there are more digits in the display, but the precision of the number as calculated (or to be displayed as per ⎕PP
) isn't sufficient to tell us what they are.
I thought I had excised all underscores by various ploys such as switching to E-format, but this case appears to be a bug. It might take a while before I get around to this one as it doesn't appear to be pressing.