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Changes between Initial Version and Version 1 of Ticket #22430, comment 13

initial	v1
19	19
20	20	My rationale was that when zlib.compression is on, the starting buffer level should always be treated as 1. This allows all additional buffers to be cleared and doesn't impact installs where zlib is off. There might be reasons I'm not aware of that would cause issues in other scenarios, but since putting this fix in place I haven't experienced any further issues.
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	22	EDIT: Whilst the code comments suggest "wp_ob_end_flush_all" is only executed on php 5.2, I've found it executing on all versions up to and including 7.3.