fix: allocate callback immediately on heap in debug mode #4203
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Addresses #4202. I have not been able to verify whether or not this fixes my issue with the stack overflow, due to it being a transitive dependency for me. However, the approach is very similar to the one taken in #4009, as suggested by @Darksonn in the issue. The only difference is that here the argument is a
FnOnce
instead of aFuture
. I'm not sure if that makes a difference with regard to stack usage.