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Changes APIs to accept
&Callable
instead ofCallable
.Same for
&Signal
but it doesn't seem to be used in parameter position.This is mostly for consistency with #900, #906 and #940.
Now, all non-
Copy
builtins are actually passed by-ref.I'm also aware that this may cause a minor inconvenience of an added
&
for ad-hoc callables (which are quite frequent), especially aroundconnect()
. I don't think it's a huge deal, but we can maybe consider making those APIs more flexible in the future, to accept both owned and borrowed callables.This PR comes with some smaller cleanups.