From 120bfab03e58a96aa52d366cadcfaded823a42df Mon Sep 17 00:00:00 2001
From: Leo Galambos <galambos@noreply.localhost>
Date: Thu, 3 Jul 2025 22:53:48 +0200
Subject: [PATCH] Add FAQ

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 FAQ.md | 29 +++++++++++++++++++++++++++++
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 create mode 100644 FAQ.md

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+# FAQ
+
+## What happens if I store a null value?
+
+Null values are stored normally. Listeners will be notified if the null differs from the previous value.
+
+## Can a listener remove itself?
+
+Yes, a listener can call `Ctx.INSTANCE.removeListener(...)` on itself if needed.
+
+## What if a listener throws an exception?
+
+Exceptions thrown in one listener will not stop other listeners from being notified, but you should handle exceptions inside the listener code.
+
+## Can I use primitive types?
+
+Yes, via their boxed equivalents, e.g. `Integer`, `Double`, etc.
+
+## How about arrays?
+
+Yes, arrays are supported and compared using `Objects.deepEquals`.
+
+## How to test with mocks?
+
+Use a mock of the `Listener` interface. The key-based typing makes it easy to isolate in unit tests.
+
+---
+
+[[Home]] | [[API Reference]] | [[Programming Guide]]
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