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Add NEWS entry.
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Add a marking phase to the free-threaded GC. This is similar to what was
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done in GH-126491. Since the free-threaded GC does not have generations and
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is not incremental, the marking phase looks for all objects reachable from
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known roots. The roots are objects known to not be garbage, like the module
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dictionary for :mod:`sys`. For most programs, this marking phase should
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make the GC a bit faster since typically less work is done per object.

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