With great power comes great responsibility. Sure, read the source. But don't think that because you followed some internal code path and figured out that it's

With great power comes great responsibility. Sure, read the source. But don't think that because you followed some internal code path and figured out that it's "safe" to pass `null` to a function that it will always be safe. If the docs for a project don't say it's safe, ask them to clarify.