testing if a parameter is a colon

[Adrien Vogt-Schilb]

hi

does anyone know if it can test whether it can be tested if an argument 
is a colon ?

the problem i have is 1==: returns %t; so right now i am using
if a==: & isdigit(string(a))==[]

but this is actually buggy

any idea?
-- 
Adrien Vogt-Schilb (Cired)
Tel: (+33) 1 43 94 *73 77*
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