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#2 is pretty common software lingo. If you’re esl you definitely are going to want to look that one up.

Pretty ironic to write "esl" instead of the expanded form.

what's ironic about it?

If someone "is ESL", it's less likely that they will know what "ESL" means, so it's another layer for them to parse.

That doesn't really fit the definition of irony...

Oh no. I guess it's my ESL showing.