FEATURE REQUEST: Scientific Notations

[Hunfen]

I wonder if you can make it understand the numbers in scientific notation.
For the 1e-5m to cm command, it returns 1e-3 cm.
I think the scientific notation can help simplify the input and output.
Of course, it looks strange for numbers with less significant digits; thus, it would be even better if the output automatically transform to general digits when the significant digit is less than two or three.