[exim] How do you test numbers?

How do you test numbers?
I did this
"${if and {
{>{$h_X-DSPAM-Confidence:}{0.7}}
{eq{$h_X-DSPAM-Probability:}{1.0000}}{1}{0}}"
My error is ,
"0.8787" is not a number inside "and{...}" condition
Any ideas?

JAS

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