Are US units correct?

[petaks01]

The physical calc doesn't show the "chinese" tail.

Only this:

CONVERT(1_km,1_)
"Error: Inconsistent units"

My guess is that it strips the inch part from the input before trying to convert and gets really confused as the "in" is a reserved word in CAS based on a previous post here.

I sure would like a working conversion/units/prefix part and if we have to skip the "in" and use "inch" everywhere thats fine with me.