3.1.2 Precision and Normalization
The built-in library uses its own internal precision for whole
numbers, which may be the range from -999999999 to +999999999.
That is probably far more than you will ever need in the built-in
functions.  For most functions, neither parameters nor return
values will be effected by any setting of NUMERIC. In the few
cases where this does not hold, it is explicitly stated in the
description of the function.

In general, only parameters that are required to be whole numbers
are used in the internal precision, while numbers not required to
be whole numbers are normalized according to the setting of
NUMERIC before use.  But of course, if a parameter is a numeric
expression, that expression will be calculated and normalized
under the settings of NUMERIC before it is given to the function
as a parameter.


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