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Under -XNumDecimals, it's possible to specify an integer literal using
compact "floating point" syntax for any floating literal constant which
also happens to be an integer. This lets us write

    1.2e6 :: Integer

instead of:

    1200000 :: Integer

This also makes some amendments to the users guide.
Authored-by: Shachaf Ben-Kiki <shachaf@gmail.com>
Signed-off-by: Austin Seipp <aseipp@pobox.com>