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+- Handle floating point exceptions, e.g. div by zero. See
+  https://wiki.sei.cmu.edu/confluence/display/c/FLP03-C.+Detect+and+handle+floating-point+errors
+  and man pages fetestexcept(3) and math_error(7).
 - On startup, the value is read from the config file... but it can't
   be used as an argument to a binary op (only a unary one) if it's
   more than one digit. Except sometimes it can. Investigate and fix.