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FWIW, I'm currently seeking project sponsorship to work on this. To do
it right, a substantial portion of the module should be coded in C and
needs to function independently of Python, with accessors provided to
for Python to wrap around.
Once, there is a fast C version, a discussion of a decimal literal can
become a reasonable possibility. It will be an uphill battle though. 
Many decimal apps have few internal constants -- most of the data comes
into the program from and external source and gets written back. A
literal itself doesn't have much utility except for playing around at
the command line. Also, there would need to be a PEP talking about how
decimals should interact with binary floats and the rest of the language
(which pretty much ignores decimals).