dbl returns a double value promoted from a <number>.
There is no need to use dbl() in double expressions, because numbers are automatically promoted to a double. This is because such promotion is lossless.
Examples
One example of dbl() use is in conditional statement to compare numbers and doubles when a number is specified first:
if-true dbl(3) greater-equal 3.5
@It would be incorrect if this printed out!
end-if
