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current-time and GMP

From: Stefan Monnier
Subject: current-time and GMP
Date: Tue, 28 Aug 2018 22:30:48 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Of the functions that use "handmade" bignums, there's also current-time.
Since this one tends to grow over time in precision than in magnitude,
I'm wondering if people have an idea what to do with it:
- keep it as is (that's the easy way out)
- use GMP's mpf or mpq numbers (that seems like a lot of work for this
  only use, tho I guess we could then use those numbers in Calc as
- use a handmade arbitrary-precision float made up of a bignum plus
  a "scaling factor" (halfway solution: less work, but less gain).


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