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bug#13580: 24.2.92; regression in calc-convert-units

From: Jay Belanger
Subject: bug#13580: 24.2.92; regression in calc-convert-units
Date: Thu, 07 Feb 2013 14:39:40 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> Please recognize the difference between dimensionless and unitless.
> 3 ft/in is dimensionless, but it has the unit "ft/in". 

"The expression is unitless when simplified"

> If the user entered "kg" as the old unit of "3 ft / in" this makes no
> sense.

Of course it does, and Calc has supported this behavior for years.
When Calc asks for Old Units:...  New Units:...,
it is regarding the expression on the stack as the coefficient of the
old units. 

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