Maybe add one or more of the following values, which add to the wierdness?!

[MorrisJohns]

'0X0' '1E0' 1E-1111 ['Infinity']

'0X0' : string that is hex for zero if converted to Number '1E0' : Exponential notation for one if converted to Number 1e-1111 : underflow (zero) ['Infinity'] : ['Infinity'] == Infinity

PS: Thanks for the grid, it is a great reminder of the evils of ==.

PPS: Not to mention 077 versus 088 (ouch - octal!).

PPPS: An == or === symbol inside the green cells of the grids made it clearer to me (using developer toolbar).