| PayloadCopy | There are situations in which rxRust needs to copy items/errors, for example
when you use subjects or cloned observables. All items/errors which are
copyable (= implement Copy) work in such situations out of the box.
Items/errors which implement just Clone but not Copy don't work out of
the box (because rxRust wants to prevent you from accidentally introducing
poorly performing observable chains). If you have such items/errors, you
might want to implement PayloadCopy for them. You can use it just like a
marker trait because there's a default method definition which simply calls
clone() to make the copy. However, take care to only implement it for
types that are cheap to clone! In multi-observer scenarios (e.g. when using
subjects), payload_copy() will be called for each single observer!
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