Thanks for the hint! It turned out the fails happened because the testing version (atan(1,1)*4: 3.14159265358979324) became too long (>16 letters) under perls with -Duselongdouble. Fixed the test and shipped 0.39.
Sat Jan 09 10:13:31 2016The RT System itself - Status changed from 'new' to 'open'
Sat Jan 09 10:13:31 2016ishigaki [...] cpan.org - Status changed from 'open' to 'resolved'