Fix MutableBinaryHeap{T} when T is Union/abstract #869
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Each MutableBinaryHeapNode needs to be fully parameterised or Julia will throw a conversion error when trying to add them to MutableBinaryHeap's nodes field.
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Each MutableBinaryHeapNode needs to be explicitly parameterised or they can end up being parameterised by a type that doesn't match the Heap when T is not concrete, and then Julia will (rightly) throw a conversion error when trying to add them to MutableBinaryHeap's nodes field.