Vanilla 1.1.9 is a product of Lussumo. More Information: Documentation, Community Support.
For the record, here is the math.SE post and here is the MO post (currently only visible to 10k+ users on the respective sites since they are deleted). I will send a message to the user on math.SE asking why they deleted their question.
I voted to undelete. If two other 10Ks do the same, the question will magically reappear.
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