Json/TODO.txt was added by thomas on r3576 http://framework.zend.com/fisheye/changelog/Zend_Framework/trunk/library/Zend/Json?cs=3576
Wrong assumption. The file was added by mike with rev. 6.Revision 3576 was a coding standard issue where windows line feeds were changed to unix by about 1/2 of the whole framework.
Greetings ThomasI18N Team Leader