Wait, wait, wait a minute. Stop the presses!
Are you saying you did some research and then came up empty and still posted? YOU ARE AWESOME.
The carrot didn't work. So now Trump is going to use the DHS stick.
In terms of mathematics, "[" would mean to include the beginning term in the interval. The ")" would mean not to include the value.
In other words, if this were [0,1) - It would mean 0 is included in the interval, but the end of the interval would be infinitesimally close to 1 without including it.
I'm not a mathsfag, so I probably butchered the termininology.
That was on purpose. See above for discussion of [] vs () in terms of mathematics.