floattofp truncates instead of rounding, and asymmetrically

Computer Algebra System written in Common Lisp

Brought to you by: kjak, l_butler, macrakis, robert_dodier, and 2 others

Milestone: None

Status: duplicate

Owner: nobody

Labels: floattofp (1) bigfloat (42)

Priority: 5

Updated: 10 hours ago

Created: 2026-07-22

Private: No

Spotted by Claude:

(%i1) fpprec: 15$

(%i2) bfloat(2.0/3.0) + bfloat(-2.0/3.0);
(%o2) -2.22044604925031b-16

Should be 0b0.