I recently stumbled on the following bug in the l3fp package:
\fp_eval:n { sin( 2pi  .0001 ) } ==> 9999.999000000002
which seems a little excessive for a function bounded by +1, 1.
\fp_eval:n { sin( 2pi  .001 ) } seems to evaluate correctly. The value
between .001 and .0001 where the bug arises is between .001853071795,
which is too small and brings on the error, and .001853071796, which
doesn't.
\fp_eval:n { sin( 2pi + .0001 ) } seems to evaluate correctly. However,
the buggy behaviour repeats at 4pi and 6pi and presumably at any
positive even multiple of pi, but not at 0 (= 0pi). For negative even
multiples,
\fp_eval:n { sin( 2pi  .0001 ) } seems to evaluate correctly but
\fp_eval:n { sin(2pi + .0001) } ==> 9999.999000000002
This aside, I greatly appreciate the facilities that the l3fp package
provides.
Andrew
P.S. Is this a *very* quiet list, or have I not configured things
correctly so that I'm missing postings to it?
