When I implemented a bunch of the special functions for bigfloats and maybe for regular floats (complex), I used the algorithms from cmucl with came from Kahan, which used signed zeroes a lot. I think that Robert changed these so as not to do different things based on the sign of zero.
Sorry. I misunderstood your comment. My fault!
What's the problem with the tex code? For tex(x[i]^2), I get $$x_{i}^2$$. I think that's right.
Fix #4679: Convert things to bigfloats
Fix #4679: bf_fmin_cobyla fails with Lisp type error
non numeric value for factlim
Merged issue-4669-numeric-value-for-factlim, which enforces factlim to be any integer value. See commit [64ff7d]
Merge branch 'issue-4669-numeric-value-for-factlim'