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Lots of these can just be normal
Task
s, since they simply rely on upstreamTask.Sources
but do not add any source paths themselves. And since 0.11.x they're all the same type anyway so changing back and forth doesn't break compatibilityThis speeds up
selective.prepare
on the com-lihaoyi/mill codebase considerably, since we need to evaluate all sources (and their transitive upstream tasks) up-front to decide what sources changed and determine the downstream tasks to run. Before this PR this ended up compiling a bunch of Scala code, after this PR it no longer does so