JSON Lines is such a delight to use. It's particular nice as a CLI interop format.
You can use dumb, fast tools (e.g. grep to quickly filter large outputs) as well as structured tools (e.g. jq).
miniblog.
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As Rust grows in popularity as a systems language, I expect that someone will develop a dynamic language explicitly designed with great interop in mind.
C++ games seem to use Lua for this, and I've seen Java projects use Groovy.
Are there any up-and-coming contenders for Rust?