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Out of interest why does this work in Scala:
val exceptions = List[Char]('+')
assertTrue(exceptions.contains('+'))
but this not
val exceptions = new Array[Char]('+')
assertTrue(exceptions.contains('+'))
Because you wrote new ArrayChar. Doing that, the argument is the size of the array, and the ‘+’ is, rather unfortunately, converted to an int to give the size. And the returned array is full of Char(0).
You should just do
Array[Char]('+'),'+'would then be single element in the Array.