Why memset called after calloc? Languages

Why memset called after calloc?

I've researched code of some library and noticed that calls to calloc there are followed by memset for block allocated by calloc. I've found this question with quite comprehensive answer on differences between calloc and malloc + memset and calling memset for just before allocated storage:
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Does calloc zero out the entire allocation? Languages

Does calloc zero out the entire allocation?

The calloc function in C is used to allocate zeroed memory capable of holding at least the requested amount of elements of a specified size. In practice, most memory allocators may allocate a bigger block in order to increase efficiency and minimize fragmentation. The actual usable block size of an...
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