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Question: How to remove the unit?

Question:How to remove the unit?

mmcdara 6149 Maple 2015
units
October 16 2022
1

Consider this piece of program

restart:
interface(version)
Standard Worksheet Interface, Maple 2015.2, Mac OS X, December 21 2015 Build ID 1097895
with(Units):
a := 3*Unit('m');
                       3 Units:-Unit('m')

I would like to define a new quantity b which is the dimensionless variant of a.
I browsed the Units package to look for a function that would "remove" the dimension of a dimensional quantity like a above (that is to get '3' alone).

As I couldn't find such a function I use to use this workaround.

b := remove(has, a, Unit);
                               3

Is this a robust strategy?
What would you propose to "remove" the dimension of a?

Thanks in advance
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