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automerge
A JSON-like data structure (a CRDT) that can be modified concurrently by different users, and merged again automatically.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Just tried it out, Github does, in fact, let you use extra slashes. I just threw a bunch of /'s onto https://github.com/////// and it loaded just fine. The problem is with the JS on this particular page. When it first loads (on my slower and older laptop there was enough delay to see this) it loads the Automerge home page just fine. Then it tries to pull in contents because of that extra / and breaks. If you go to the Docusaurus home page (which is what Automerge's home page is built using) you can get similar behavior).
https://docusaurus.io/
https://docusaurus.io//
Try the second with JS turned off.
So it seems the problem is two-fold:
1. Automerge has the wrong canonical link, which HN pulls from submissions and replaces submitted URLs with (this is, I think, largely to help with de-duping).
2. Docusaurus' JS (which Automerge is using) takes a perfectly valid URL and generates a 404.