Incomplete set of aliases for Keys True and False

[PFython]

Aliases for True/False in __str__. Given that 1, 1.0, and True are considered equivalent as dictionary keys, it would be helpfully explicit to create all possibilities as aliases regardless of which Key is given initially. Likewise False.

>>> x = CleverDict({True: "Is this?"})

>>> print(x)

CleverDict
    x[True] == x['_True'] == x._True == x[1] == x[1.0] == 'Is this?'

[PFython]

Closed in version 1.5 and higher.