Shorthand uncertainty breaks unit display

[yunruse]

Steps

>>> conf.measure_uncertainty_shorthand = True
>>> G

Expected behaviour

The unit should display with an uncertainty.

Actual behaviour

An AssertionError is raised.

[yunruse]

The problem is in the uncertainty function in noether.display, which seems to have problems when float introduces an e.

[yunruse]

I genuinely don't understand what past me meant by this >.<;