json: code NaN and Infinite floating values to null
json: code NaN and Infinite floating values to null

JSON does not have proper representations of such values, therefore just
use something which can be decoded by parsing. Of course, decode should
be aware of such problem. When reading with TBufferJSON, null values
from JSON converted into NaN
root-mirror/root,karies/root,olifre/root,karies/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,olifre/root,olifre/root,olifre/root,karies/root,olifre/root,karies/root,root-mirror/root