On Tue, Oct 11, 2022 at 10:32 AM Marcin Błażejowski <marcin(a)wrzosy.nsb.pl&gt; wrote: I'm getting an error on the second loop but no crash. Did you really mean "crash" (segfault or otherwise halted by the OS). Anyway, the condition provoking the error in the second case was a kinda subtle internal thing, to do with the fact that setting a bundled object directly to "null" is how the statement "delete bun.key" is implemented. But that internal thing should not interfere with your formulation above, and that's now fixed in git. Allin