longer necessary. The Implementation can now become a simple 'using'
directive (#134).

moved to there.

std::uncaught_exception() must be used instead of
std::uncaught_exceptions() (#46).

exceptions thrown by the deleter (#28), furthermore it's noexcept
now.

to scope_exit (fixes #42, fixes #29).

behaviour for LValue references (see #41).

to work.

called from within the dtor, this may otherwise cause UB (fixes #7).