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PrebuiltJar attempted to transitively fetch runtime deps. This means that if you had a chain of prebuilt jars depending on each other, e.g. [binary] -> A -> B -> C -> D, we would attempt to traverse the runtime deps of A 1x, B 2x, C 3x and D 4x. This is unncessary as JavaBinary does the transitive traversal itself, so just stop doing it.
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JavaBinary was resolving transitive runtime deps via concat(A, concat(B, concat(C, ...))). This is extremely inefficient since concat adds another stack frame for every call which can result in StackOverflowException. Use flatMap instead.