I recall from playing with Arduino that using heap-allocated strings will cause heap fragmentation, which is why they should be avoided. This was C++, doesn't t

I recall from playing with Arduino that using heap-allocated strings will cause heap fragmentation, which is why they should be avoided. This was C++, doesn't this count for rust as well? Do kmalloc/kzmalloc do magic to circumvent this problem, similar to jemalloc?