treat spaces as single-char bytes instead of strings for python 2/3 #92
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The initial state of self._prev is pretty suspect currently. python2 will gladly compare a string to an int (coming from wrap_ord()) and quietly return False. Likewise it will do tests for one char of a bytestring like:
b'x' in [ord(b'x')] # unexpectedly False
This patch fixes handling of the initial condition and comparing spaces but not the other issue of the class level character constants.