PHP7.4: ErrorException: Trying to access array offset on value of type int [Solution]

[romtam]

I'm opening an issue here in hopes that some people might see it, so that they can easily know how to fix.

Current Behavior

When we run /setup with PHP7.4 and click Install, an error is thrown. When we turn on debug, we see:
ErrorException: Trying to access array offset on value of type int

Possible Solution

Implement the fix from this commit, located at /var/www/polr/vendor/symfony/console/Input/ArrayInput.php

Your Environment

• Version or latest commit hash (git rev-parse HEAD): f9622d7
• Environment name and version (e.g. Chrome 39, PHP 7.0, etc): PHP 7.4

[ngunyimacharia]

Is there any way this can be permanently solved? Bump up the dependancies?