Stumped: 0 "not a quantity"

[Chris Maden <crism@xxxxxxxxxxx>]

I have this code in my stylesheet:

(let auths-loop
    ((auth-idx 0))
  (if (<= num-auths
          auth-idx)

Jade reports:

2nd argument for primitive "<=" of wrong type: "#<unknown object
20930952>" not a quantity

In what sense is 0 not a quantity?  Obviously, the assignment hasn't
worked correctly, but I can't figure out how.

-Chris
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