Suggest an alternative to

swap

Instantiate/configure structs recursively, based on build environment. (YAML, TOML, JSON and env).

Why do you think that https://github.com/goraz/onion is a good alternative to swap

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with swap. Optional.

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