Hello The recently added test extensible module has a small oversight: it lacks input validation, which made it easy to crash the backend with invalid input with the test module loaded. While this doesn't seem like a critical issue for a test module, the commit message also mentions that this could be a template for extension developers, so I think it is worth fixing.
There's a similar issue in test_bitmapset: that's an older commit, but it shows the same issue. I attached fixes to both as 0001/0002.
0002-test_bitmapset-Decode-arguments-with-readBitmapset.patch
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0001-test_extensible-Reject-other-node-types-before-calli.patch
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