Function set_partial_eq 

pub fn set_partial_eq<M>(
    a: &M,
    b: &(dyn PartialReflect + 'static),
) -> Option<bool>
where
    M: Set,

Compares a Set with a PartialReflect value.

Returns true if and only if all of the following are true:

• b is a set;
• b is the same length as a;
• For each value pair in a, b contains the value too, and PartialReflect::reflect_partial_eq returns Some(true) for the two values.

Returns None if the comparison couldn’t even be performed.