When you use a numeric field in an alphabetic context, it is converted to a display form. See $STRING, $EDIT, LIST, MOVE, and SET.
When you use an alphanumeric field in a numeric context, it is converted to numeric form if possible before it is evaluated. See the $NUMBER function.
If an alphanumeric value is converted to a numeric value, a compile‑time warning message is issued and, if the source does not contain a valid numeric value, a runtime error occurs.
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