[fpc-pascal] Sin function

[faber]

Hi,
according to docs/reference sin function should print 0.0 when

Writeln (Sin(Pi):0:1);

but, with fpc 2.4.0 and 2.4.2 (x86) I've get "-0.0", such a result is
not entirely correct.
This is a bug (in sin func.) or something wrong with the formatting ?

best regards
faber