Exim version 4.66
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PH/01 Two more bugs that were introduced by 4.64/PH/07, in addition to the one
      fixed by 4.65/MH/01 (is this a record?) are fixed:

      (i)  An empty string was always treated as zero by the numeric comparison
           operators. This behaviour has been restored.

      (ii) It is documented that the numeric comparison operators always treat
           their arguments as decimal numbers. This was broken in that numbers
           starting with 0 were being interpreted as octal.

      While fixing these problems I realized that there was another issue that
      hadn't been noticed. Values of message_size_limit (both the global option
      and the transport option) were treated as octal if they started with 0.
      The documentation was vague. These values are now always treated as
      decimal, and I will make that clear in the documentation.

****