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doc: update NUMERIC to state that only some ops are exact
Report by Tom Lane
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@ -498,11 +498,13 @@
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<para>
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The type <type>numeric</type> can store numbers with a
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very large number of digits and perform calculations exactly. It is
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especially recommended for storing monetary amounts and other
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quantities where exactness is required. However, arithmetic on
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<type>numeric</type> values is very slow compared to the integer
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types, or to the floating-point types described in the next section.
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very large number of digits. It is especially recommended for
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storing monetary amounts and other quantities where exactness is
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required. Calculations with <type>numeric</type> values yield exact
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results where possible, e.g. addition, subtraction, multiplication.
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However, calculations on <type>numeric</type> values are very slow
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compared to the integer types, or to the floating-point types
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described in the next section.
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</para>
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<para>
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