tree b14068fad577bb2f001dca5e4e7b3dd5fdbe43cf
parent 7fb01ecd9c844e8644fb24c5db61ddf9e89d8062
author Jason Rhinelander <jason@imaginary.ca> 1494349684 -0400
committer Jason Rhinelander <jason@imaginary.ca> 1494427459 -0400

Defer None loading to second pass

Many of our `is_none()` checks in type caster loading return true, but
this should really be considered a deferral so that, for example, an
overload with a `py::none` argument would win over one that takes
`py::none` as a null option.

This keeps None-accepting for the `!convert` pass only for std::optional
and void casters.  (The `char` caster already deferred None; this just
extends that behaviour to other casters).