Add missing &

[AnyOldName3]

I'm not entirely sure how these were missed, but there were still ref and unref calls I wasn't expecting on a hot path. This takes a further five seconds off the startup time of the app I'm working on, so between this and the previous PR, that's nearly half the launch time gone.

[robertosfield]

I'm surprised the compiler isn't doing an optimization of this method to avoid the copy.

[AnyOldName3]

It's all inline, so in principle you'd think it could see that there aren't any side effects, but maybe it's extra cautious because the ref count is an atomic. The project's compiled as C++20, where atomics can be waited on, so in principle another thread could be poised to do something, in which case the optimisation wouldn't be safe.