[CM] Bug or expected? Quoting numbers.

[bil at ccrma.Stanford.EDU]

I think '3 is 3, although the spec is vague, they
give an example '145932 = 145932.  +1 is a legit
number, but +nan. is not -- at first glance I think
I introduced this bug when I added nan payloads.
Will fix -- thanks very much for the bug report!