Should "%" times "m" result in "m" by default?

[kendonB]

library(units)
#> udunits system database from C:/R/Library/3.5/units/share/udunits
as_units(10, "%") * as_units(10, "m")
#> 100 [%*m]

^{Created on 2019-01-22 by the reprex package (v0.2.1.9000)}

I would have expected to see:

as_units(10, "%") * as_units(10, "m")
#> 1 [m]

Of course, this is a general issue for all continuous units where 0 is meaningful.

[edzer]

The issue is really whether 10 [%] should automatically simplify to 0.1 [1], since

> set_units(0.1, 1) * set_units(10, m)
1 [m]

There are earlier threads where we discussed this, and concluded that maximal simplification is not what most users will want.

[Enchufa2]

And still, [%*m] seems odd...

[kendonB]

I agree that most users would not want to automatically simplify % to 1. But when multiplying with a measurement unit like above? Surely no one is interested in how many % kgs something is?