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Type representing floating point types, such as ``FLOAT`` or ``REAL``.
This type returns Python ``float`` objects by default, unless the
:paramref:`.Float.asdecimal` flag is set to ``True``, in which case they
are coerced to ``decimal.Decimal`` objects.
When a :paramref:`.Float.precision` is not provided in a
:class:`_types.Float` type some backend may compile this type as
an 8 bytes / 64 bit float datatype. To use a 4 bytes / 32 bit float
datatype a precision <= 24 can usually be provided or the
:class:`_types.REAL` type can be used.
This is known to be the case in the PostgreSQL and MSSQL dialects
that render the type as ``FLOAT`` that's in both an alias of
``DOUBLE PRECISION``. Other third party dialects may have similar
behavior.
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