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Pants

What are users' experience with `py_resolve_format = "symlinked_immutable_virtualenv"`? I'm not really noticing any speed difference exporting the symlinked version vs regular. Maybe 10-15 second (i.e. 20%) improvement. Testing on `2.19.0`.

The implementation history is that the symlink was the only thing we supported, and we added support for a standalone venv copy so you could install pip into it and mess with it, which would be extremely dangerous with a symlink into the cache.