If it’s not connected to the internet, that certainly does take away a significant cause of problems. Good luck

In theory if there are no security holes, a user account can only mess up its own account.

Note that what steps you want to take will really depend on who these users are and what you want to achieve. There’s a vast chasm between allowing in, say, friends or colleagues, vs. letting random people on the internet access it. The latter will mean someone will intentionally look for exploits, which means e.g. regularly applying security updates becomes far more pressing.

If you are letting in random strangers, I’d look into only giving them access within a separate container or ideally virtual machine per user as an extra precaution unless what you’re making available is very stripped down.

To me Crystal is too often different from Ruby for the sake of being different in ways that just makes it infuriating to work with because the effort of porting code to it is much higher than necessary, and the main advantage it offer is being compiled. That’s just simply not enough for me to consider switching.

Ruby.

My desktop manager is Ruby. My text-editor is written in Ruby. I’m about to switch to a terminal written in Ruby, and a shell written in Ruby.

"Four score and seven years ago"‍ from the Gettysburg Address… Many languages have or had words for counting in 20’s. They’ve just mostly gone out of fashion.

Wiktionary suggests the common proto-Germanic root of eleven/twelve, elf/zwölf are likely to have been “ainalif” and “twalif” - “one left over” and “two left over”.

They’re both Germanic languages, just like Dutch, German, Norwegian, Danish and a few others. Same origin. All of them have variations of tre/dre/drei/thir/þre/þrēo (say them with sounds halfway between t and d as the first sound, and you’ll see how similar they are) followed by variations of ten/teen/tin/tan/ton/tien/zehn as a suffix for ten (again, pick a halfway point between t and z and it’s easier to see how similar they are).

In Old English it was þrēotīene ( þ is “th”), and in Old Norse it was þrettán, same as modern Icelandic, so the first common root is even further back, but you can see the similarity. The *hypothesized proto-Germanic root is þritehun. (þriz + tehun.

But, it goes back even further than that. The Romance languages (tres, trois etc) shares the same proto-Indo-European root (hypothesized to be tréyes) for three with proto-Germanic.

The names for numbers are ancient, and though not always recognisable, sometimes recognizable variants pop up even further away than you’d expect. E.g. Pashto (Southeastern Iran) has dre for three, Sanskrit has trí, Indonesian has tri, all of them descendants of the same proto-Indo-European root.