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The
dual
member of operators is assumed to be a class. However, forTRUE
andFALSE
, it is an object.This leads to errors with
simplify()
orliteralize()
within thedemorgan()
method when applied onTRUE
orFALSE
objects (e.g., #85)There are two ways of fixing this: either assign the dual member of
TRUE
andFALSE
to the corresponding class, or add a__call__
method to these objects returning themselves.This PR adopts the latter approach to respect as much as possible the singleton design pattern.