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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Pharo has resumable exceptions, which are useful for coding and a delight when debugging. I don't know why they aren't more common.
Conda is a delight to use. Proper dependency resolution, fast installs, and MKL builds of numpy by default!