cargo-c | build and install C-compatible libraries | DevOps library

I'm migrating to AWS SSO for cli access, which has worked for everything except for kubectl so far. While troubleshooting it I followed a few guides, which means I ended up with some cargo-cult behaviour, and I'm obviously missing something in my mental model.

I've been unable to query my existing contract recently due to Unable to create Enum via index 128, in Alive, Tombstone when using api.query.contracts.contractInfoOf. I get this error both on the command line and in the polkadot-js apps explorer.

These are the steps I took:

1. Deploy a contract with a salt
2. Retrieve the contract deployedAddress
3. Use contractInfoOf
4. const contractInfo = await api.query.contracts.contractInfoOf(deployedAddress);

I've tried downgrading ink! to 3.0-rc5, 3.0-rc4, 3.0-rc3 and then compiling but it doesn't seem to make any difference. Whenever my contract is built it references rc6 at the top:

I use MathJax with my Jekyll blog on GitHub Pages. In fact, I wrote a blog post on exactly what steps I took to set up MathJax 2.7.5: "MathJax in Jekyll" (August 2018)

For a couple of posts, I wanted to use a psmallmatrix environment, like the one from the mathtools package: $$\begin{psmallmatrix} 1 \\ 0 \end{psmallmatrix}$$. I know how I would create such an environment in actual TeX, using the \newenvironment command: "How do I make a small pmatrix?"

But to get the command "pre-loaded" in MathJax 2.7.5, I was doing this, cargo-culting some code from MathJax's version of the AMSmath package:

I am trying to link three HTTP service hops in NodeJS together into a single Zipkin trace. I have three services

In my JS code I import a module like so:

I am trying to run embedded Tomcat 9 inside Maven 3 for integration testing purposes. I was led to cargo-maven2-plugin by other SO answers.

So, attempting to follow the instructions found here:

https://codehaus-cargo.github.io/cargo/Static+deployment+of+WAR.html

I have this fragment in a simple POM: