Add type casters for nullopt_t, fix none refcount #499
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std::nullopt_t
(orstd::experimental::nullopt_t
) as part ofstl.h
. This is needed, for example, if default value for an optional arg inarg_v
is anullopt
, as seen in the test.none
refcount bug as spotted in Add default and converting constructors for all concrete Python types #464 (comment).