Questions on history of zend_module_entry

Hello, for two separate reasons I was recently reviewing zend_module_entry's layout and usage and there are two things I don't understand: 1. Why does zend_module_entry have a .size member, if it's not actually used anywhere as far as I can tell from both reading code and setting debugger watchpoints? One place it probably _ought_ to be used is when we copy the module entry in zend_register_module_ex (https://heap.space/xref/php-src/Zend/zend_API.c?r=733023b2#2381), but sizeof(zend_module_entry) is used instead. 2. Why do we copy the module entry in zend_register_module_ex anyway? I've dug through git history a bit but haven't found anything notable so far. It seems like we should store the parameter and document it needing to have a static lifetime (or a heap-allocated lifetime which just leaks), which would satisfy both get_module() and the hybrid extension/zend_extension hacks. In any case, the particular combination of these two points makes it seem like something is broken, wrong, or obsolete and needs to be documented as such. I am hoping someone here knows the history or background on this!