> Note that 68 bit accuracy corresponds to 20 decimal digits, so
> current doc is correct in this aspect.
OK, I mistake "bits()" for "digits()".
I found that documentation for "precision()" is vague:
In sf.spad:
precision : () -> PositiveInteger
++ precision() returns the precision in digits base.
precision : PositiveInteger -> PositiveInteger
++ precision(n) set the precision in the base to n decimal digits.
It seems that Common Lisp standard doesn't specify float format,
float can be binary represented, or "as on the IBM 360 and 370,
which use radix 16".
So I doubt the usefulness of currying such flexiablity in FriCAS,
I suggest remove "precision", and use bits() instead.
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