Do not force &Option<T> in public API; use Option<&T> instead
#617
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What does this PR do?
Some public functions had
&Option<T>as one of their arguments. This is undesirable, because it forces the caller to have a literalOption<T>to which a reference is then taken.If the caller only has a
Tthat it does not wish to consume, this forces a clone. Taking anOption<&T>is more flexible, as&Option<T>can be converted toOption<&T>using theOption::as_ref()inherent method, and if one already has a bareT, then it's easy to create anOption<&T>by taking its address and wrapping it intoSome.The call site is also slightly simplified, as one no longer needs to write
&None.