Require user defined conversion when multicasting to subject with non-matching type #1459
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The implementation of
MulticastSubject
performed a coercion of the source sequence when the type of values in the sequence did not directly match the type of the subject. This PR makes this behavior more strict: conversions are still allowed, but they have to be supported on type upcasting, interface implementation, or a user-defined explicit conversion between the two types.This eliminates cases where the type of the source sequence is an interface being multicast to a subject type declared with a different interface.
Fixes #1458