Node 16 will reach EOL no later than a few months after Jasmine 5 is
released. Experience with Node 12 and Node 14 has shown that our
dependencies, especially dev dependencies, move on from past-EOL Node
versions fairly quickly. That can make it difficult to continue supporting
them. Since long term support for past EOL Node versions is a non-goal and
many users expect that Node versions will only be dropped in major
releases, it's better to drop it in 5.0.
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