I interpret the issue with joy for the new year.

Cast Double to Char is optimal in order to toast to the new year,
but it seems little adapted to make other things.

CLEAR
#define 
CREATE CURSOR casting (fn B)
INSERT INTO casting VALUES (123456789012345)
FOR k=1 TO 50
	INSERT INTO casting VALUES (fn/10)
NEXT 

SCAN
 ? fn,CAST(fn as V(100))
endscan

Expected is : CAST(fn AS V(100)) = TRANSFORM(fn,"@^")

If CAST returned the expected result,
and withed to return the result puts into effect them,
enough to make a

CAST(CAST(fn AS N(X, Y)) AS V(100))

Fabio