Z_CACHE_SLOT changed meaning in PHP 7.3?

Hi! While trying to put together a patch to make PECL/uopz compatible with PHP 7.3[1], I've stumbled upon commit ca035f2[2] and commit 1a63fa6[3]. The former removed Z_CACHE_SLOT and related stuff, but the latter reintroduced it with an apparently somewhat different meaning. If that is correct, this change should be documented in UPGRADING.INTERNALS, and perhaps it might even be better to rename the RECV_INIT cache and the related macros, so any extension (probably few, if any) would already fail at compile time. Thanks! [1] <https://github.com/krakjoe/uopz/issues/79> [2] <http://git.php.net/?p=php-src.git;a=commit;h=ca035f26aa296acf553f289e2d459fd052367db2> [3] <http://git.php.net/?p=php-src.git;a=commit;h=1a63fa6ec9b0bacbb726e60c3c212e7d97b518c6> -- Christoph M. Becker