Change:
~~~~~~~~
-- quick copies of string representations of wonky numbers
local serNaN = tostring(0/0)
local serInf = tostring(1/0)
local serNegInf = tostring(-1/0)
~~~~~~~~

To:
~~~~~~~~
-- quick copies of string representations of wonky numbers
local serNaN = tostring(0)
local serInf = tostring(1)
local serNegInf = tostring(-1)
~~~~~~~~

AND

Change:
~~~~~~~~
if tonumber(str)==v or str==serNaN or str==serInf or str==serNegInf then
~~~~~~~~

To:
~~~~~~~~
if tonumber(str)==v  then
~~~~~~~~