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Re:Show HN: Investorsexchange.jl – parse trade-level stock m... by daenney on Wednesday August 31, 2022 @12:14PM (#32664328)
It's not illegal in domain names. Take a look at the SRV type in the domain name system. It's underscores galore.

However, for host names or for a URL's host component, you're limited to hyphens.

In this case though it's just the name of a Julia package[1], which isn't bound by either the rules of domain names or host names as .jl is not a TLD.

[1]: https://pkgdocs.julialang.org/v1/creating-packages/#Package-...

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