(I know I know, PHP 7.4 has not been released, but Im logging this as Im testing PHP 7.4 alpha 2 with my production app - feel free to comment and then close if you want :))

On a (large) production Symfony 4.3.2 app running PHP 7.3.6 - No issues :-)

Switch to PHP 7.4 alpha 2 (fpm, all dockerized) then I get the following message. I tried pushing all the memory limits higher but ultimately nothing allows this to work.

(1/1) OutOfMemoryExceptionError: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 140176491831296 bytes)

in MergeExtensionConfigurationPass.php line 125