Bug: can't have range of powers of ten without the awkward 1

[iverks]

This:

#import "@preview/unify:0.5.0": numrange
$numrange("e2", "e3")$

which i would expect to render as 10² - 10³ raises an error.
Instead i have to use

#import "@preview/unify:0.5.0": numrange
$numrange("1e2", "1e3")$

which renders the a little awkward 1 * 10² - 1 * 10³

[ChHecker]

Nice catch! Just fixed it.