Hidden initialization parameters

It seemd that the number of hidden parameters is increasing between versions.
a small check reveals that:

version 8.1.7.4 contains 300 paramters.

version 9.2.0.8 contains 613 paramters.

version 10.2.0.3 contains 1179 paramters.

Here is the query I used to locate these parameters:

SELECT
a.ksppinm "Parameter",
a.ksppdesc "Description",
b.ksppstvl "Session Value",
c.ksppstvl "Instance Value"
FROM
x$ksppi a,
x$ksppcv b,
x$ksppsv c
WHERE
a.indx = b.indx
AND
a.indx = c.indx
AND
a.ksppinm LIKE '/_%' escape '/';