Conditional expression ":-" deprecated?

[John Morrissey]

We have a vendor product that only supports usernames shorter than 64
characters. I used the unlang expression:

  if ("%{#User-Name:-0}" <= 63)

to avoid sending accounting with longer usernames to it, which yielded:

server buffered-dpi-esc4 {
+- entering group preacct {...}
++? if ("%{#User-Name:-0}" <= 63)
WARNING: Deprecated conditional expansion ":-".  See "man unlang" for details
        expand: %{#User-Name:-0} -> 70
? Evaluating ("%{#User-Name:-0}" <= 63) -> FALSE
++? if ("%{#User-Name:-0}" <= 63) -> FALSE

I got the ":-" expression from unlang(5), which doesn't mention that it's
deprecated. I used this expression to specify a default length of 0 since
unlang(5) states that %{#attr} returns an empty value if attr isn't present,
and I wasn't sure how FreeRADIUS would react to a numeric comparison against
an unset value.

I'm using:

  if (User-Name && "%{#User-Name}" <= 63) {

instead for now, but is the ":-" expression really deprecated, and is there
an alternative equivalent? How will FreeRADIUS react to an unset value in a
numeric comparison?

john
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