Firebird 2.1 Language Reference Update

Better alternative: Internal function TANH()
External functions (UDFs)
Description: Returns the hyperbolic tangent of the argument.
Result type: DOUBLE PRECISION
Syntax:
tanh (number)
Declaration:
DECLARE EXTERNAL FUNCTION tanh
DOUBLE PRECISION
RETURNS DOUBLE PRECISION BY VALUE
ENTRY_POINT 'IB_UDF_tanh' MODULE_NAME 'ib_udf'
Library: fbudf
Added in: 1.0 (Win), 1.5 (Linux)
Changed in: 1.5, 2.1.3
Better alternative: Internal function TRUNC()
truncate, i64truncate
Description: These functions return the whole-number portion of their (scaled numeric/decimal) argument. They
do not work with floats or doubles.
Result type: INTEGER / NUMERIC(18)
Syntax:
truncate (number)
i64truncate (bignumber)
Declarations:
Caution
Both functions round to the nearest whole number that is lower than or equal to the argument. This means that
negative numbers are also “truncated” downward. For instance, truncate(-2.37) returns -3. The internal
function TRUNC, available since Firebird 2.1, always truncates toward zero.
Bug alert
Contrary to what's mentioned above, in versions 2.1, 2.1.1 and 2.1.2 anything between -1 and 0 is truncated to
0. This anomaly has been corrected in Firebird 2.1.3 and above.
In Firebird 1.0.x, the entry point for both functions is truncate:
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