General-Purpose Mail Filter
When two operands on each side of a binary expression have
mailfromd evaluator coerces them to a
common type. This is known as implicit type casting. The rules
for implicit type casting are:
The construct for explicit type cast is:
where type is the name of the type to coerce expr to. For example:
string(2 + 4*8) ⇒ "34"
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