[ruby/date] Prevent converted gregorian date from GC
m_sf_in_sec calls rb_rational_new that can cause GC.
m_sf_in_sec
rb_rational_new
https://github.com/ruby/date/commit/6de449ab6a
[ruby/date] Prevent converted gregorian date from GC
m_sf_in_sec
callsrb_rational_new
that can cause GC.https://github.com/ruby/date/commit/6de449ab6a