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But it's in the map, so it's in use.

This remark is what triggered my comment

> It becomes invisible to the precise collector

So does the conversion to uintptr remove it from the root lists the GC searches?

It's a map[uintptr]unsafe.Pointer. The key is invisible to the collector, but the value is an unsafe.Pointer, which is will be managed for you by the precise collector.

Ah, stupid me! Thanks for clarifying it.

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