I tried the double equal signs and they make no difference. In other words, they act like the normal == symbol.
There is no white space after ==. One example is ca[1] == 1, which has two equal signs. I copied it from my notebook. But if I copy the equation from here to my notebook, it becomes the normal == symbol. Therefore, you cannot try it.
Hit a white space behind the repeated equal sign to get them into a single symbol and read about Equal; because there is also SameQ consisting of three consecutive equal signs the white space is needed to start symbol conversion.
