ApplicationID / PackageName is defined as case-sensitive
I found a small bug where packageName comparison was done with equalsIgnoreCase(). So I researched to confirm that Android Application IDs are case-sensitive:
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fdroidserver uses case-sensitive naming since it is based on GNU/Linux filesystems, which are case-sensitive by default.
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"the application ID looks like a traditional Java package name, the naming rules for the application ID are a bit more restrictive" https://developer.android.com/studio/build/application-id
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Java is a case-sensitive language for all names used in .java files: "In the Java programming universe, case-sensitive String keys are ubiquitous" "Java package names... are case-sensitive" https://docs.oracle.com/javase/8/docs/technotes/guides/preferences/designfaq.html