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On architectures where `sizeof(long)` != 8, "%" PRId64 will read junk from memory. This was seen on various Debian builds where test/functional/legacy/close_count_spec.lua would fail due to `1<C-w>c` emitting an error like `E488: Trailing characters: close-87944975647104`. Changing the `Prenum` parameter to int64_t ensures it is safe to use `"%" PRId64`, and make another small step towards removal of the use of `long`.