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f5e81fe182
We're currently using a libxml buffer, which requires copying the buffer to zend_strings every time we want to output the string. Furthermore, its use of the system allocator instead of ZendMM makes it not count towards the memory_limit and hinders performance. This patch adds a custom writer such that the strings are written to a smart_str instance, using ZendMM for improved performance, and giving the ability to not copy the string in the common case where flush has empty set to true. Closes GH-16120.