these weren't getting corrected since php-cs-fixer 3.0 due to a change in the default configuration for native_function_invocation. Since the builds are randomly choosing to use php-cs-fixer 2.19 at the moment, the consistency is a problem.
this happens if the parent process is killed via SIGINT, because its stdin will be closed, interrupting a blocking read. This might also happen if the user pressed CTRL+D, so we don't die unless end of socket stream was also detected.
closes#4335
