764     /**

   765      * Converts an object for a comparison with a number. Almost identical to {@link #toNumber(Object)} but

   766      * converts {@code null} to {@code NaN} instead of zero, so it won't compare equal to zero.

   767      *

   768      * @param obj  an object

   769      *

   770      * @return a number

   771      */

   772     public static double toNumberForEq(final Object obj) {

   773         return obj == null ? Double.NaN : toNumber(obj);

   774     }

   775 

   776     /**

   777      * Converts an object for strict comparison with a number. Returns {@code NaN} for any object that is not

   778      * a {@link Number}, so only boxed numerics can compare strictly equal to numbers.

   779      *

   780      * @param obj  an object

   781      *

   782      * @return a number

   783      */

   784     public static double toNumberForStrictEq(final Object obj) {

   785         if (obj instanceof Double) {

   786             return (Double)obj;

   787         }

   788         if (obj instanceof Number) {

   789             return ((Number)obj).doubleValue();

   790         }

   791         return Double.NaN;

   792     }

   793